2 STMicroelectronics LED Solutions

ST Solutions for LED Lighting

Jiří Smutka

Industrial & Multi-Market Competence Center

Applications Lab Prague, Czech Republic

Mai 2011

2

Presentation Outlook

ST LED Driver Product Range - overview

1. Energy-Efficient Solutions for LED Lighting

• Off-Line LED Drivers

• DC-DC Converters based Solutions

2. ST Solutions for Video Display / Matrix drivers

3. ST Solutions for Communication in Lighting

4








High Brightness LED evolution

Key Factors for AC/DC LED Drivers

Power Factor Lighting Power Supplies > 25W must have full

PFC.

Also <25W PFC needed to solve the problems

related to harmonic distortion in multi power

systems. ENERGY STAR Program Requirements for Solid State

Lighting Luminaries, Version 1.1: PF > 0.7 and > 0.9 respectively for Residential and Commercial.

Reliability For high lifetime and MTBF (key advantage of

LEDs), it is strongly recommended NOT using

electrolytic capacitors, especially input ones (high

voltage stress)

Retrofit lamp & bulb replacement 3-20W output power range solutions

Space constrains (lamp housing)

Compatibility with existing wall dimmers

6

Driving LEDs using AC-DC Solutions

3 to 10 W applications10 to 75W

applications

75W and up applications

(street lighting)

MONOLITHIC

HVLED805, VIPerPlus)

DISCRETE

L6562A + MOSFETCC/CV

TSMxx,SEAxx

HIGH PF DISCRETE

L656x +

MOSFET+RECTIFIER

CC/CV

TSMxx, SEAxx

HIGH PF + LLC

L656xA/T + L6599A/T

+ MOSFET +

SYNC/RECTIFIER

Key Benefits:

Extended temperature range

Innovative zero voltage

switching & resonant

topology:

efficiency > 92%

Aggressive form factors

Key Benefits:

Control and power section

separated

Post-regulation with dimming

No limitation to the number

of LEDs within a string

Cost-effective solution

Key Benefits:

Integrated

Robust

Miniaturized form factors

7

8

Driving LEDs using AC-DC Solutions

Isolated Non Isolated

FlybackCC/CV

FlybackCC/CV

BuckBuck-Boost

CC/CV

HPF

Flyback

FlybackCC/CV

PFC

HV

BuckCC/CV

BuckCC/CV

BuckCC/CV

BuckCC/CV

Resonant

HPFBuck-Boost

CC/CV

PFC

PFC

3W

150W

LED 3 – 10W = monolithic solution

HVLED805

Low components

Isolated

Primary side regulation CC/CV

Viper + family

General auxiliary supply use

Isolated or non isolated solution

HPF flyback as option

9

FlybackCC/CV

FlybackCC/CV

BuckBuck-Boost

CC/CV

HPF

Flyback

HVLED805

10

N.A.

N.A. CDC

SOURCE DRAIN

SOURCE

GND

IREF

ZCD/FB

COMP

Vcc

DRAIN

DRAIN

DRAIN

N.A.

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

N.C.

N.A.

N.A.

SOURCE DRAIN

SOURCE

GND

IREF

ZCD/FB

COMP

Vcc

DRAIN

DRAIN

DRAIN

DRAIN

DRAIN

N.A.

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

N.C.

SO16N

• CC/CV regulation with no

optocoupler•

• 800V, avalanche rugged internal

power MOSFET

• Internal HV start-up circuit

• Quasi-resonant ZVS operation

• Valley skipping at medium-light

load , burst mode operation at no-

load for under 60 mW

consumption

• Automatic self-supply

• Input voltage feedforward for

mains-independent CC regulation

• Low quiescent current (<1mA)

• SO16 package

PWMCONTROLLER

CC-CVREGULATOR

Vout

GND

Vin

• Only one IC

• No secondary

Rsense dissipation

11

Improved BOM, Form Factor & Efficiency

Standard Isolated

Solution

Constant Current

Controller

Sense resistor in

series with LEDs

Opto-coupler for

galvanic isolation

Auxiliary winding :

- Vcc for HVLED805

- Constant Current ctrl

LED current

set by resistor

Primary Side Regulation

Solution with HVLED805

• 2 Ics + 1 Opto

• Rsense*I² dissipation

12

Typical load regulation cv/cc

0 200 400 600 800 1000 1200

0

1

2

3

4

5

6

Ou

tpu

t V

oltag

e [V

]

Output Current [mA]

HV Startup is

ON

High current accuracy:

+/-5%

High voltage accuracy

+/-2.5%

Current Regulation Principle

Steady-state

relationships valid in

DCM only:Rs

RI

2

nI REFout

n

I

Rs

VI

SpkCPpk

S

FWSpkout

T

TI

2

1I

Demag

.

S

RQ

+

-

AUXILIARY

WINDING

TFW

Vin

Iout

Constant

current

Ic

Rs

V

c

Ip

Is

R

IREF

REFCS

FWC

T

T

R

VI0I -

IREF

-

Vc

R

t

t

t

IPpk

TFW

I

c

Ts

ISpk

IREF

Note: Iout not dependent

on either Vin, Vout or

Tsw

VC

o Input voltage range (VIN): 185 - 265 VAC

o Main frequency (fL): 50 - 60 Hz

o Maximum (rated) output power: 4.2 W

o Output: IOUT = 350 mA ± 5%

o Over voltage = 12 V max

o Current ripple < 10% IOUT

o Minimum switching frequency in

o normal mode: 70 kHz

o Target average efficiency (from 1 to 3 LEDs) > 70 %

o Maximum input power in no-load < 100 mW

EVALHVLED805 - 5 W Applications: HVLED805

Primary Side Controlled Flyback Topology

14

10R8

C12.2uF400V

1nFC3

2.5V

COMP SOURCE

DRAINVDD

+

-

CURRENTCONTROL

IREF GND

FB/ZCD

U1

ALTAIR05T

120KR2

STTH1L06AD1

C42.2uF

5.6KR4

C51nF

BRMB6S-RC

T1CORE E13

10kR6

L1

470uH

C22.2uF400V

33KR3

R1

221W

C74.7nF

C6470nF

STPS1H100A

D3

D2

LL4148

C8100uF

Low ESR

GND

12V - 0.35A

AC IN

AC IN

10

R5

C9100uF

Low ESR

3.3R7

N.C.R9

2.2nF

C10

HVLED805

EVALHVLED805 - 5 W Applications: HVLED805

Primary Side Controlled Flyback Topology

15

Performance

16

VIPer37

VIPer25

VIPer17 VIPer27

VIPer35VIPer15VIPer05

VIPer07

VIPer28 VIPer38

VIPer16 VIPer26VIPer06

DIP7

SO16N

DIP7

SO16N

DIP7

SSO10SDIP10

6 W 12 W4 W 15 W

24 7 30 4.5

Viper + Portfolio and Roadmap

SuperMESH

Technology 800V

avalanche rugged

Power MOSFET

Controller

17

Brown out

Over Load Delay

PWM operations with

settable IDLIM

Over Voltage

Over Temperature

shut down

No auxiliary

Quasi ResonantFixed Frequency

with Jittering

Internal OA - simple

Non Isolated loop

2° OCP

Feedback

disconnection

Extra Power Timer

Burst Mode

Soft start

VIPer x7 VIPer x8

Brown out

VIPer x5 VIPer x6Basic features

Auto restart

Auto restart

(fixed time)

Main features

800V

Avalanche Rugged

Fixed Frequency

with Jittering

Peak current setting

Trainings/VIPerx7_28EXT.ppt

Trainings/VIPerx7_28EXT.ppt

Trainings/VIPerX5training.ppt

Trainings/VIPER16_26training.ppt

18

Using of current Lim feature for HPF

Max peak current is programmed by external Resistor – Rlim

This pin can be used to modulate peak current by input sin

voltage => allows to achieve High Power Factor

3.5W and 7W high PF Off-line LEDs driver schematic

19

ALTERNATIVES

- No PF required removal of component , then input Elcap necessary and lower output

capacitance

- No isolation required optocoupler removal and Vipx6 family usage (op-amp

available)

3 to 10 W Applications: VIPerPlus

High Voltage Converters in Flyback Topology

Power Factor Correction ( > 0.9 ) 3.5W ( 350mA ) with VIPer17 and 7W (700mA) with VIPer27

90 - 265Vrms Input voltage range

Open / Short circuit protection

No High voltage electrolytic capacitors

Optional low voltage electrolytic capacitor

>80 % Efficiency

20

EVLVIP27-7WLED

AN3212

7W high PF Off-line LEDs driver

LEDs current ( 700mA no e_caps )

CH4(green) = Iout,

CH3(red) = Vout,

CH1(brown) = Vdrain

Vac = 115V Vac = 230V

PF = 99% PF = 96%

21

7W high PF Off-line LEDs driver

LEDs current ( 700mA with 1000uF )

CH4(green) = Iout,

CH3(red) = Vout,

CH1(brown) = Vdrain

Vac = 115V Vac = 230V

PF = 99% PF = 97%

22

3 to 10 W Applications: VIPerPlus

High Voltage Converters in Flyback or Buck Topology

Key features Main benefits

• Single package approach:

• integrated

• robust

• sophisticated

• Miniaturized form factors

• Easy design

• High power factor > 0.7 • Compliant to energy saving

regulations

• No high voltage el-cap

usage

• High reliability (extended

MTBF)

VIPerPlus high voltage converters in

flyback topology, associated to TSM1052,

constant voltage, constant current

controller ( or new CC/CV controller

SEA05). Buck topology for not isolated

applications with low cost current

control circuit

Evaluation board Application note Description

STEVAL-ILL017V1 AN2811Not Isolated Flyback constant

current source with VIPer17HN

STEVAL-ILL026V1 AN29613W not-isolated off-line LED

driver based on VIPer22AS

EVLVIP17-5WCHG AN2840Constant current output Viper17

flyback converter

23

LED Middle power (10W to 70W)

L6562,3,4 (PFC chip)

PFC converter

HPFF

Buck converter

24

BuckBuck-Boost

CC/CV

HPF

Flyback

FlybackCC/CV

PFC BuckCC/CV

25

C

C

M

L6561TM PFC

8pinOVP stat./dyn.

L6562IMPROVED

TM PFC

L6561 pin-to-pin

Improved THD

Extended supply range

Powerful gate driver

L6563/SADVANCED

TM PFC

TBO

FDBK disconnection

Brownout

Reduced consumption

PWM interface

Input volt. Feedforward

L4981A/BAVG CURRENT

MODE PFC

Input voltage Feed-forward

Load Feed-forward

Progr. Turn-On Threshold

OVP & Over-current Protection

L6562ATM PFC

L6562 enhanced

Lower CS threshold

New gate driver

Higher efficiency at

light load

L6563/HHigh voltage

start-up

T

M

L6564TM PFC

L6562A enhanced


PWM interface

STM PFC Chips Roadmap

26

Features & Block Diagram L6562A

APPLICATIONS:

PFC PRE-REGULATORS FOR:

• ELECTRONIC BALLAST

• EC61000-3-2 COMPLIANT SMPS (FLAT-TV, DESKTOP PC,

MONITOR, GAMES)

• HI-END AC-DC ADAPTER/CHARGER

• Precise Internal Reference

(1% @25°C)

• 1.1V Current Sense threshold

• DIGITAL Leading-edge blanking on

Current Sense

• Disable function on FB input

• Ultra Low Start-up Current (<60µA)

• Low Quiescent Current (2.5mA typ.)

• ZCD input for TM

• Two-level OVP Protection

• THD optimizer circuit

• Extended supply voltage range

• -600 / +800mA totem pole gate driver

with pull-down and voltage clamp

• Package: DIP-8/SO-8

TRANSITION MODE PFC

CONTROLLER

VREF2

OVERVOLTAGE

DETECTION

VOLTAGE

REGULATOR

UVLO

INTERNAL

SUPPLY BUS

+

-

= 2.5V

-

+

+-

STARTER

+

-

ZERO CURRENT

DETECTOR1.4 V

0.7 V

VCC

8

1 2 3 4

ZCD

VCC

INV COMP MULT CS

GD7

5

GND6

25 V

Starter

stop

LEADING-EDGE

BLANKING

DIS

LOWER & UPPER

CLAMPS

DIS -

+0.45 V

0.2 V

DYN

OVPSTAT

OVP

MULTIPLIER AND

THD OPTIMIZER

R

SQ DRIVER

& CLAMP

ERROR

AMPLIFIER

PWM

COMPARATOR

1 V

VREF

27

L6563/SADVANCED

TM PFC

TBO

FDBK disconnection

Brownout

Reduced consumption

PWM interface


L6562ATM PFC

L6563/HHigh voltage

start-up

L6564TM PFC


PWM interface

STM PFC Chips Roadmap

=

=

=

+

L6563/SADVANCED

TM PFC + High Voltage Start up

L6562ATM PFC +

L6562ATTM PFC

Extended thermal range= L6562ATM PFC +

Application of L6562A family in LED

PFC

Transition mode PFC

up to 150W for WR

FOT up to 3kW

HPFF (High Power

Factor Flyback)

Simple isolated

solution up to 50W

Buck

Modified Buck

converter

28


EVL6562A-LED AN2983 Constant current inverted buck

LED driver using L6562A

EVL6562A-LED AN2928 Modified buck converter for LED

applications

STEVAL-ILL019V1 UM0926 32W High PF Flyback offline +

RGGB LED driver with LED

channel brightness regulation

EVL6562A-

35WFLB

AN2838 35 W wide-range high power

factor flyback converter

demonstration board using the

L6562A

STEVAL-ILL13V1 AN2928

UM0670

80W off-line LED driver with

dimming based on L6562A

STEVAL-ILL27V1/2 AN3111 18 W single-stage offline LED

driver based on L6562A

STEVAL-ILL034V1 AN3256 LED driver for an A19 lamp based

on the L6562A for USA market

PFC: transition mode (TM) control

Variable switching frequency, constant TON

Operation close to the boundary between

continous and discontinuous conduction mode,

@ZVS

Peak current mode control, simple, low-cost.

Suitable for lower power levels (< @150W

approximately)

29

IL IAC

ON

MOSFET

OFF

MULT

GND

L6561

L6562A

L6564

L6563x (*)GD

COMP

CS

RECTIFIED

MAINS

VCC

ZCD INV

(*) L6563: 14

pin IC with

advanced

logic

10 to 50 W Applications: Transition Mode PFC

in Isolated Flyback and inverted Buck Topology

HPF Flyback Section:

• Line voltage range: 90 to 265 VAC

•Power factor (load = 50 %): 0.9 minimum

• Minimum efficiency: 85 % at full load

inverted buck section:

• CC operation up to 600 kHz

• Fixed-Off-Time Peak-Current-Mode control

• No sub-harmonic oscillation

• No need for slope compensation

• High-efficiency (>90% with 6+ LEDs)

•Ripple current is constant also when input and output ( n. LED )voltage change

• Very deep dimming (<1% @250 Hz) due to IC immediate restart

• Up to 200 V LED driving capability

30

35W Isolated HPFF and inverted Buck Topology


• High power factor fly-back

topology supported > 0.9

• Compliant to energy

saving regulations

• Control and power section

separated

• Suitable for high power size

• Design flexibility

• Post-regulation with

dimming solution

• Dimmable solutions

• High output voltage • No limitation to the number

of LEDs within a string

• Based on cheap controller

and MOSFETs

• Cost-effective solution

L6562A, transition mode power factor corrector in

flyback topology.

•associated to TSM1052, constant voltage,

constant current controller (or new CC/CV

controller SEA 01 coming soon) for single LED

columns

•Associated to inverted buck converter based

on L6562A or DC/DC converter for multiple

LED columns

Ideal for:

Single /Multiple LED columns

31

STEVAL-ILL019V1 UM0926

L6562A Isolated High PF AC/DC LEDs Driver 35W:

EVL6562A-35WFLB

SuperMESH3 MOSFET

32

STEP-DOWN based on low voltage controller

Inverted (modified) Buck Topology

33

nVLED

VIN

INDUCTANCE

• charges on VIN – nVLED

• discharges on nVLED

M

D

LDIODE spec

• VRRM > VIN

• IAVG = I LED x (1 – D)

MOS spec

• VDss > VIN

• IRMS2 = I LED

2 x D

M MD

I LED

STEP-DOWN based on low voltage controller

Transition Mode PFC in Inverted Buck Topology

GND

GD

CS

ZCDCOMP

INV

VCC

MULT

L6562A

L6563A

VIN 48 VDC

PWR GND

VCC 15V

DIMMING 1 (PWM 250HZ VARIABLE DUTY )

C6

R7

R4

C2

R8

C5

D2

D1

R3

R2

R6

R5

R9

M1

L1

LED

D3

D4

C7

350 mA

34

M MD

I LED

FIX OFF time

ON time limited

by peak

current

By adding the connection marked in red, makes the output current ripple NOT DEPENDENT

on the how many LEDs are supplied.

It is possible to demonstrate that ILED = (VCS – K Vin)/Rs

Where :

VCS = Current Sense Threshold Voltage K = (TOFF Rs)/ 2 L1

Rs = R8 in the below schematics

L6562A DC-DC Inverted Buck Improvement

GNDGD

CSZCDCOMP

INV

VCC

MULT

L6562A

PWR GND

VCC 15V

10%

C6

R7

R4C2R8

C3

C5

D2

D1

R3

R2

R6

R5

R9

M1

L1

LED

D3

D4

C7

R

VIN 48 VDC

Being K = R4/ R+R4 and already

fixed K from the former equation,

it is possible to determine R4 and

calculate R

Compensation resistor size

35

EVL6562A-LED AN2983 + AN2928

Vin = 88V to

265V ac

Input Filter

PF controller

L6562A PF controller

L6562A

MODIFIED BUCK CONVERTERHIGH POWER FACTOR BOOST CONVERTER

400V 80W LOAD

HIGH POWER FACTOR BOOST

CONVERTER:

• Transition mode operation

• Wide input voltage range 88V to 265V ac

• Regulated output voltage 400V

MODIFIED BUCK CONVERTER:

• Continuous conduction mode operation

• Fix Off Time (FOT) network designed

• LED current setting 350mA, 700mA and 1A

STTH1L06

STP8NM50FPSTPSC806D

STF9NM50N

Microcontroller

ST7LITEU05

PWM GENERATOR

PWM GENERATOR:• PWM frequency 250Hz

• 0% to 100% DC variation

• Input voltage 3.3V to 35V

• Knob for regulation

80 W and up Applications (Street Lighting):

PFC Boost + inverted Buck Converter

36

STEVAL-ILL013V1

AN2928, UM0670

L6562A: HPF Buck-Boost & Inverse Buck

37


• Buck-Boost topology• Simple

• Low Cost

• Transition Mode Operation• Lower Switching Losses

• Spread of EMI Spectrum

• High power factor > 0.8

• Compliant to energy saving

regulations. Suitable for

residential lighting

• Open Load Protection

• Short Circuit Protection• Robust


STEVAL-ILL027V1 AN311118 W single-stage

offline LED driver

STEVAL-ILL034V1 AN3256

LED driver for an

A19 lamp based

on the L6562A for

USA market

HPF Buck Boost

HPF Inverse Buck

STEVAL-ILL027V1

38

1

2

P2

R14100K

1

2

LED -

LED +

C8

470nF/~305V acL1 20mH

C10

470nF/~305V ac

3

2

4

1-

+

D1

INV1

GD7

COMP2

ZCD5

VC

C8

MU

LT

3G

ND

6

CS

4

U1 L6562AD

R12

100K

R16

100K

R10

20K

R7

130K

R8

100K

C5

2.2uF/50V

C6

NC

C7

1nF/50V

R312K

R15500K

R9500K

C9

150nF

~305V ac

D8

STTH1R06A

R412K

T1

Q1

STD11NM50N

R533R

D3NC

R6

2R7

R112R7

D7

STTH3R06A

C1

100uF/100V

STEVAL-ILL027V1

39

1

2

P2

R14100K

1

2

LED -

LED +

C8

470nF/~305V acL1 20mH

C10

470nF/~305V ac

3

2

4

1-

+

D1

INV1

GD7

COMP2

ZCD5

VC

C8

MU

LT

3G

ND

6

CS

4

U1 L6562AD

R12

100K

R16

100K

R10

20K

R7

130K

R8

100K

C5

2.2uF/50V

C6

NC

C7

1nF/50V

R312K

R15500K

R9500K

C9

150nF

~305V ac

D8

STTH1R06A

R412K

T1

Q1

STD11NM50N

R533R

D3NC

R6

2R7

R112R7

D7

STTH3R06A

C1

100uF/100V

LED High power (>70 – 80W) isolated

L6562,3,4 (PFC chip) + L6599A(T)

PFC converter

Resonant converter (isolation)

40

BuckCC/CV

ResonantPFC

MAIN FEATURES:

• Wide input mains range (85 to 305 Vac)

• Output voltage: 48V @ 2.7 A

• Efficiency: >90% @ 115Vac – Full load

• No-load consumption 0.3W @ 230Vac

• Long life, high MTBF (No EL-CAPS)

• Mains harmonics: according to EN61000-3-2,

JEITA-MITI

• EMI: meets EN50022 Class B

• Safety: meets EN60950

• MIXED PTH/SMT FOR LABOR COST

REDUCTION,

• 1 heat-sink only required (for input bridge)

• PCB double layer 90x170 mm

• Maximum height: 30 mm

Ideal for:

Multiple LED

columns

80 W and up Applications (Street Lighting):

Transition Mode PFC + Resonant Controller

Evaluation board Application

note

Description

EVL130W-SL-EU AN3105 48V-130W Led Street Lighting SMPS based

on L6562AT & L6599AT for European input

mains range

EVL130W-STRLIG AN3106 48V-130W Led Street Lighting SMPS based

on L6562AT & L6599AT for wide input

mains range

STEVAL-ISC002V1 90W PFC + Resonant CV SMPS

41

fm2

2 kC

0.1 1 100

0.5

1

1.5

2

2.5

3

M x kC 0

M x kC 0.5 Qmax

M x kC 2 Qmax

M x kC Qmax

M x kC 101

B x kC

x

a

Q=0.38

Iout

Vin

VoutaM

Q=10

Q=0.19

Q=0.76

Q=0

(open output)

Inductive region

Current lagging (ZVS)

f f r1f f r2

1

1 k

k=5

Capacitve region

Current leading (ZCS)

ZVS-ZCS borderline

Resonance:

Load-independent point

All curve have slope = -1/ k

1

2

k

1 k×

fr11

2 Ls Cr

fr21

2 Ls Lp( ) Cr

3 reactive elements, 2 resonant

frequencies

fr1

fr2

Resonant Converter: LLC Circuit

42

Half-b

rid

ge

Drive

rVin

Cr

Vout

LLC tank circuit

Ls

Lp

Vout

Center-tapped output with full-wave

rectification

(low voltage and high current)

Single-ended output with bridge

rectification

(high voltage and low current)

Q1

Q2

Resonant Converter : LLC Circuit & Features

LLC features

Multi-resonant LLC tank circuit

High efficiency:>96% achievable

Variable frequency control

Fixed 50% duty cycle for Q1 & Q2

Dead-time between LG and HG to

allow MOSFET’s ZVS @ turn-on

fsw fr, sinusoidal waveforms: low

turn-off losses, low EMI

Equal voltage & current stress for

secondary rectifiers; ZCS, then no

recovery losses

No output choke; cost saving

Integrated magnetics: both L’s can be

realized with the transformer.

Preferably integrated into a single

magnetic structure

AC/DC Stage

SuperMESH3

MDmesh II

FDmesh II

43

L6599A: an IC to remember

50% Duty Cycle, variable frequency control of ZVS resonant Half Bridge (HB)

Up to 500KHz operating frequency

Superior stand-by performance Burst-mode operating at light load

Direct interface with PFC controller

High performance protections Two-level OCP: frequency-shift and latched shutdown

Latched disable input

Input for brownout protection or power ON/OFF sequencing

Non linear soft-start for monotonic output voltage rise

High accuracy oscillator

600V rail compatible high side gate driver with integrated bootstrap diode and high dV/dt immunity

300/800 mA high side and low side gate drivers with UVLO pull-down

Available in PDIP16 and SO16N packages

44

DIP16SO16N

Application

note

Description

AN2450 LLC resonant half-bridge converter design

guideline

AN2644 An introduction to LLC resonant half-

bridge converter

47

L6563, L6564

PWM is turned OFF in

case

of PFC's anomalous

operation

L6563 can be turned OFF

at light load for energy

saving

Vinac Voutdc

L6563/4

PWM

PFC PRE-REGULATOR DC-DC CONVERTER

OUT

PWM_LATCH

PWM_STOP

RUN

PFC_OK

PFC FAULT:Low input voltage RUN

Reduced consumption

PWM stopped ( NOT LATCHED)

PWM_STOP

Feedback disconnection PFC_OKReduced consuption

PWM stopped (LATCHED)

PWM_LATCHTransformer saturation CS

Interface with PWM/QR Controller

Digital Constant Current Controller

for multi-string LED driving e.g. Streetlight

Description & purpose: complete platform (HW/SW) for LED multi-string constant current control based on an innovative methodology (Patent Submitted)

Key Features: Input DC Bus Voltage:48V

LED String independent average current control

inverted Buck Topology

System Power: 4x30W max

Switching freq. 60kHz

LED current ripple <10%

Global dimming from 0% to 100% at 225Hz

Key Benefits: High Efficiency

Cost effective

Key Products: STM8S208RB STPS1L60, STN3NF06

Application: LED Streetlight

LED Driving

ADC-1

30W

PWM-1 4

8V

PW

M-2

AD

C-2

PW

M-3

AD

C-3

PW

M-4

AD

C-4

30W

30W

30W

48

49

Digital current control based on STM8 / STM32

ADC sampling @ Ton/2

Triangular Carrier (Center aligned pattern)

PWM

Average current

OC Register

Key Advantages:

• Inductor current reconstruction with fine resolution (<=3%)

• Cost effective, high performance with real average current control

• No passive components for filtering

Gate Signal

Vse

nse

Solution Architecture: 120W LED Street-light and high

power 4 channel LED

ADC-1

VIN

STM8S20xx

Microcontroller

®

PWM1

30

W

PWM-1

48V

30

W

30

W

30

WP

WM

-2

AD

C-2

PW

M-3

AD

C-3

PW

M-4

AD

C-4

50

Vin=48V VuC=5V

Four LED Outputs STM8S Trimmer for

dimming

Joystick for

control

setting

Reset

BOM List:

• STM8S208RB

• STN3NF06L

• STPS3L60

From Idea to Demoboard:

LED Current Controller STM8S-based

51

STEVAL-ILL031V1

AN3151

Multi String Current Control Method

Cyclical update of the PI controller output for the 4 channels

52

Off-line LED drivers: Evaluation boards

summary (1/2)

Solutions available and technical documentations

P/N Order Code Vin (VAC) Iout (mA) Vout (VDC) Comments AN

VIPER12A (*) STEVAL-ILL005V1 85 to 265350 & 700 &

10503.5 to 15

Flyback constant

current sourceAN1916

VIPER22A (*) STEVAL-ILL001V185 to 135 or

185 to 265350 3.5 to 28

Flyback

dimmableAN2042

VIPER17HN(*) STEVAL-ILL017V1 176 to 265 500 7 Vmax

Not Isolated

Flyback constant

current source

AN2811

VIPER22A STEVAL-ILL026V1 85 to 265 350 0 to 40Buck constant

current sourceAN2961

(*) plus TSM10x

53

Off-line LED drivers: Evaluation boards

summary (2/2)

Solutions available and technical documentations

P/N Order Code Vin (VAC) Iout Vout (VDC) Comments AN

L6562A STEVAL-ILL016V2 120Vac±20% 700mA 40Vmax

15W HP Flyback

constant current

source

AN2711

L6562A EVL6562A-35WFLB 90 to 265 700mA 48V

35W HP Flyback

constant current

source

AN2838

L6562A STEVAL-ILL013V1 85 to 265350mA, 700mA

or 1A400V

80W PFC Boost +

Modified buck

converter

AN2928

UM0670

L6562AT

L6599ATEVL130W-STRLIG 85 to 305 2.7A 48V

130W PFC Boost

+ LLC LED SMPSDRAFT

L6562A STEVAL-ILL027V1 120Vac±10% 350mA 54V

18W single stage

off-line LED

driver

DRAFT

L6562A STEVAL-ILL019V1 85 to 265 4x350mA 48V32W off-line

RGGB LED driverUM0926

L6562A EVL6562A-LED 48V (+/-20%) 350mA Up to VinDownstreem

Inverted Buck CCAN2928

54

55








Driving LEDs using DC-DC Switching Regulators

L598x

L692xL597x L6902

L7980/1

LED770x

L7985/6

Battery powered applications

• Single & multiple Li-Ion, Ni-MH

and alkaline battery systems

• Automotive battery range

DC BUS powered

applications

Up to 48 V

LED770x

L6920

A597x

PM6600

L692xL7987/8 up to

63 V in

development

Boost topology for

multi-rows applicationsBoost topology Buck Boost topologyBuck topology (Typical)

ST1S10 STCF07L6726A*

* PWM Controller

STLA02

LED770x: boost topology

Evaluation Board Application note Description

STEVAL-ILL020V1 AN2809 LED7706: 6-row / 30-mA LED driver

with boost converter for the

backlight of LCD panels

STEVAL-ILL021V1 AN2810 LED7707: 6-row 85 mA LED driver

with boost converter for LCD panel

backlighting

MAIN FEATURES:

• Vin = 4.5 to 36 V

• Maximum RMS switch

current: 2.5A

• Parallelable channels for

higher current (LED7707)

• LED current: up to 85mA/ch

(LED7707)

• Channel to channel current

mismatch: ±2%

• Up to 20kHz PWM dimming

(1%-100%, LED7706)

Ideal for:

Consumer: mid to large size LCD

TV, MNT

Automotive: navigation displays

and dash board

Industrial: lighting, displays,

emergency lighting

Slope Compensation


• Up to 6/8 ROWs with 30 mA

max current capability (adj.)

• ROW disable option

• Great flexibility in the

application coverage of

all the mobile PC screen

size (8”-17”)

• Internal Power MOSFET • Save application cost

and real estate

• LED failure (open and short

circuit detection)

• Soft-start, Programmable OVP

protection, Thermal shutdown

• Full and flexible fault

management

• 500 ns minimum dimming time

(1% minimum dimming duty-

cycle at 20kHz)

• ±2 % current matching

between rows

• Superior brightness

uniformity, with tight

current matching

• Pulse-skip power saving mode

at light load

• Longer battery life and

new energy regulation

compliancy (VESA-NEBL)

• Ceramic output capacitor

supported

• Save BOM cost

• Housed in QFN4x4 24L

package

• Compactness

Compact, flexible and cost effective

solutions capable to drive up to 80 LEDs,

with PWM or SMBUS interface

Ideal for:

Notebook/ Netbook/ Nettop

PM660x: Monolithic LED Driver Family for Mobile

PC LCD Panel Backlighting

PM6600: Typical application circuit

Design-support material Description

Evaluation board

STEVAL-ISA056V1

6 rows - 30 mA LEDs driver with boost

converter for notebook pc LCD panels

backlight based on PM6600

Documentation,

application components

calculation ws

Available on request

Monolithic solution with BOOST and 6 embedded

rows drivers, capable to drive up to 60 LED.s

Main applications:

• Notebook/ Netbook/ Nettop

Ideal for:

Wide input voltage range (4.7V-28V)

Up to 10 white LEDs per row

High efficiency (>90%)

Current capability per row up to 30mA

, ±2 % current matching between

rows

PM6602: Typical application circuit

Design-support

material

Description

Evaluation board &

Application Note

Available on

request

Monolithic solution with BOOST and 8 embedded

rows drivers, capable to drive up to 80 LED.

PWM/SMBUS interface is adjustable.

Main applications:

• Notebook/Netbook/Nettop

Ideal for:

Wide input voltage range (3.3 V-28 V)

Up to 10 white LEDs per row

High efficiency (>90%)

Current capability per row up to 30mA , ±2 %

current matching between rows

SMBUS/PWM interface

STLA02

20mA Boost LED Driver for Backlight


• Input Voltage Range 2.5V To

12V

• Suitable for portable

devices powered by a

single cell Li-Ion battery

• 2.3 Mhz Fixed Frequency • Small Inductor

•Less than 1µA Stand-by Current • Longer battery life

• PWM Input Brightness Control

with 300:1 Dimming Range

• Tight Dimming

capability

• Internal Soft Start • No Inrush Current)

• Ceramic output capacitor

supported

• Save BOM cost

• Package DFN 2x2 6L • Compactness

VIN

L

CINSTLA02

RFB

EN/PWM

VIN

LX

VOUT

FB

GNDILED

VIN

L

CINSTLA02

RFB

EN/PWM

VIN

LX

VOUT

FB

GNDILED

Ideal for:

Small LCD Display Backlight (7”),

Keyboard Backlight E.S. Available

Max # LED Vin=12V Vin=24V

ILED=350mA 10 17

ILED=500mA 6 10

Rough Estimation from calculus: VF=3.5V,

fsw=250kHz, L=47uH

Driving LEDs with L597x family: alternative

topologies: Positive Buck-Boost

L5973D

#LED limited by:

IOUT,MAX = 2A =>

LED Accuracy: +4.5% and -4.78% with VSENSE=525mV

DA is the actual duty cycles considering power losses

MAX,OUTAMAX,LED IDI 1

1

2

1

21R

R

R

V

R

R

R

VI

S

REF

S

FBLED

L7980/1: up to 28 V, 3 A monolithic step-down


• More than 3A in small

QFN3x3-8L or in HSOP8

package

• Minimum external

component count

• Compactness

• P-channel power MOS • No bootstrap capacitor

required

• 100% duty cycle

• Save application cost

• Wide input voltage range

(4.5 V up to 28 V)

• Flexibility of the

application (5 V, 12 V

buses)

• Compatible with MR16

standard

• Adjustable switching

frequency (250 KHz, adj up

to 1 MHz)

• Synchronization

capability (180° out of

phase)

• Small output filter

• Small input cap

• Internal Soft-start • No inrush current

• Inhibit pin • Energy saving

• Suitable for MLCC output

filter

• Small & cheap Cout

Ideal for:

Driving up to 6 LEDs with Vin up to 28 V

General lighting/ MR16 halogen bulb

replacement

L7985/6 up to 38V

in development

Application IDEA for LED-MR16 retrofit lamps:

L7980 evaluation board

Functionalities High switching frequency to ensure

compactness

Significant efficiency improvement by

reducing the voltage reference to less than

200mV

Very low current ripple to improve LED

lifetime

High reliability thanks to convection cooling

L7980

0.6V

L7980

0.6V

L7980

0.18V0.42V

ST1CC40 – what is it ?

ST1CC40 , step down constant current LED driver in small outline package

Input Voltage range 3.5V – 18V

Output current 3A peak

Synchronous Rectification to increase efficiency

Fedback Voltage Vfb for current sensing very low value 100 mV – thus minimising losses on sensing resistor.LED current = V fb / R sense

PWM dimming achieved by toggling Inhibit / DIM pin with square wave of variable duty cycle

Fixed Switching Frequency

800 kHz

Extra Functions

Inhibit - Voltage on pin V > 1.2V device ON ; V <0.4V device OFF

Cycle by cycle over current protection

Thermal protection

Internal Soft start to reduce inrush current at start up

Package

VFQFPN8 4x4 ; SO8

65

Typical Application Circuit

Driving LEDs usign DC-DC converters:

Evaluation Boards Summary

Part Number Order Code Vin Ioutmax Comments AN

L5973D STEVAL-ILL007V112Vac

12V to 24V dc1A

High Intensity LED driver for

MR-16 format based on

L5973D

AN2559

L6920D STEVAL-IILL008V1 1V to 3V 350mACree LED Flashlight with

L6920DAN1941

L6902 STEVAL -ILL010V1 8V to 30V 350mAHigh Intensity LED Dimming

Driver based on L6902AN2129

STCS1A STEVAL-ILL014V1 4.5V to 40V up to 1.5AHigh Brightness Linear LED

Driver based on STC1A UM0422

LED7706 STEVAL-ILL020V1 4.5V to 32V20mA

per channel

LEDs Driver with Boost

Converter for LCD Panels

Backlight

AN2809

LED7707 STEVAL-ILL021V1 4.5V to 32V60mA

per channel

LEDs Driver with Boost

Converter for LCD Panels

Backlight

AN2810

L6726A STEVAL-ILL023V1 8V to 18V 1A / 1.5A / 2.8A

Buck synchronous LED Driver

for high current LED based on

L6726A + MOSfets

UM0677

STLD40D STEVAL-TLL001V1 3V to 5.5V up to 20mAWhite LED Controller in

Boost topologyAN2333

L6562A EVL6562A-LED 48V 350mAConstant current inverted Buck

LED driver AN2928

Buck Converters LED Driver Summary

Buck- Boost Converters LED Driver Summary

Boost Converters LED Driver Summary

eDesignStudio: what is it?

eDesign studio

is a SW platform that helps and speeds-up the design-in of

STMicroelectronics products for power conversion applications:

AC-DC conversion

DC-DC conversion

AC-DC LED driving*

DC-DC LED driving*

*coming soon on www.st.com

The new, easy power management design tool

http://www.st.com/

Where to find it

1. Go to st.com support tools & resources (see below arrows) SW tools simulators

& CAE resources simulators

2. Click on SMPS eDesign Studio on the next page

3. Login on my.st.com (register yourself if not yet done)

The external version works

only on-line. Nothing

must/can be downloaded.

UPgrades are guaranteed.

It is also possible a direct

access by typing

www.st.com/edesignstudio

1

2

72








73

Overview on Power Logic Applications

Arcade Gaming & Gambling Machine

White Goods

Large Panel / Signs

Automotive Interior & Exterior

Traffic Panels /Matrix

Back-Lighting

Special Lighting

LED Illumination for gaming / gambling machine

Front Display Panels & LED Illumination for Washers, Ovens etc.

Full-color, Monochrome High-resolution Large Displays

Dashboards, Car Radios, signal lights, CHMSL and other lighting applications

Traffic Variable Message Signs (VMS), variable speed limit signs, parking guidance systems

LED Lighting applications from architectural to special illuminations (mood lighting)

LCD panels Backlighting

STP08C/D05, STP16Cxxx05

STP16Cxxx05

STP16CP/C05,

STP16Dxx/S05, STP24DP05,

STP1612PW05

STP08CP05,

STPIC6C/D595

STP08/16Dxxx05,

STP24DP05

STP04CM05

STP1612PW05

STP16PWL05

74

LED drivers Power Logic

Main Applications require manipulation of LED current and time to produce images:

ST provides a wide range of High-Innovative-Performance products for Design needs to drive LEDs. The STPxxyy05 is the excellent solution to extract maximum performances from LED application.

SPI interfaces, PWM, Current Gain

LEDs driving constant current (except STPIC6C/D595)

full output error detection, auto power shutdown

4,8,16,24 Channel drivers

1 to 400 mA driver current range per channel

Series STPxxyy05

Key Advantages:

Mono-Multi-Full-Colour LED display/signs

Traffic-Backlighting Display

Gaming Machine and White goods

Architectural Lighting

KEY Features:

High accuracy on current driving

Footprint Compatible for 8 and 16 channel

Extended temperature range -40 to 125C

Shift

Register

(serial to

parallel)

____

CLRSRCK

__

G

SERIA

L IN

RCK

PG

ND

SERIA

L OUT

Enable

and

Latch

Po

wer

DM

OS

O/P

s

Typical application

76

STP08/16xxy05 –

8/16 channels, 5-100mA LED drivers

OUT 0 OUT 1

OE/DM2

LE/DM1

16 bit shift register

Latch and Enable

Power

saving

detection

Open/Short Circuit Detector

Control

logic

Analog stage

SDI

CLK

SDO

OUT 15

Thermal

shutdown

R-EXT

77

STPxxyy05 summary

Part Number N ch ILED (mA)

ΔILED Error

detection

Auto

Power

Saving

Balanced

Turn

ON/OFF

Staggered

output

delayBetween bits Between ICs

STP04CM05 4 80 ÷ 400 ±1% (80÷400mA) ±6%

STP08CP05 8 5 ÷ 100 ±1.5% (20÷100mA) ±3%

STP08DP05 8 5 ÷ 100 ±1.5% (20÷100mA) ±5%

STP16CP05 16 5 ÷ 100 ±1.5% (20÷100mA) ±5%

STP16CPS05 16 5 ÷ 100 ±1.5% (20÷100mA) ±5%

STP16DP05 16 5 ÷ 100 ±1.5% (20÷100mA) ±5%

STP16DPS05 16 5 ÷ 100 ±1.5% (20÷100mA) ±5%

STP16CPP05 16 3 ÷ 40 ±1.2% (5÷40mA) ±5%

STP16CPPS05 16 3 ÷ 40 ±1% (5÷40mA) ±2%

STP16DPP05 16 3 ÷ 40 ±1% (5÷40mA) ±2%

STP16DPPS05 16 3 ÷ 40 ±1% (5÷40mA) ±2%

STP16CPC05 16 5 ÷ 100 ±1.5% (20÷100mA) ±5%

STP24DP05 24 5 ÷ 80±6% (5÷15mA)

±3% (15÷80mA)±6%

STP1612PW05 16 3 ÷ 60 ±1.5% (3÷60mA) ±6%

78

Main features

• 8 x 3 Channel groups of constant current

output channels

• Adjustable output current through one

external resistor for each group of 8-

channel (5-80mA)

• Short and Open Output Error Detection

• Serial Data IN / Parallel Data OUT

• Gradual output delay (30ns for each group

RGB)

• Low voltage power supply (3V to 5.5V)

• Thermal Shutdown with flag pin

• 25MHz Clock Frequency

Application

• Full-color High Resolution LED Display

• Colored Traffic Signs

STP24DP05 – 24 channels, 5-80mA LED driver

µC

STP24DP05

R1..8 G1..8 B1..8SPI

LED Block3.3v

Temperature

Sensor

OE

-

R/G

/B

DM

LE

5v

79

Main features

• 16 constant current output channels

• Adjustable output current through one external

resistor (3-60mA)

• Selectable 12/16-bit gray-scale brightness control

• Selectable enhanced PWM for “ghost effect”

reduction

• Short and open LED detection

• 8-bit current gain control, 256 steps in two

selectable ranges

• Gradual output delay (40ns for each group of 4

channels)

• Selectable 16-bit/256-bit serial data in format

• 30MHz clock frequency

Applications

• Video display LED panels

• RGB backlighting

• Special lighting

µC STP1612PW05

out1 out2 …... out16SPI

OE

DM

LE

VLED

REXT

µC STP1612PW05


OE

DM

LE

VLED

REXT

µC STP1612PW05


OE

DM

LE

VLED

REXT

STP1612PW05 – 16 channels, 3-60mA LED driver,

12/16 bit Gray-scale, 8-bit current gain control

Energy-Efficient Solutions for LED Lighting:

Brochure

http://www.st.com/stonline/products/promlit/pdf/brlig

hting1009.pdf

http://www.st.com/stonline/products/promlit/pdf/brlighting1009.pdf

http://www.st.com/stonline/products/promlit/pdf/brlighting1009.pdf

81








What is DMX 1/2

DMX = Digital MultipleX for remote control of advanced lighting system, including motorized lamps to set light intensity,

light color, lamp rotation

for Wired Communication systems (twisted pairs + RS485 as PHY) in Theatre Stage Lighting,

Exhibition Lighting…

82

What is DMX 2/2

DMX512 uses asynchronous data transmission up to 250kBd/s (to dimmers, scanner,

motorized decoder).

Serial transmission and daisy chain configuration up to 512 nodes (so called DMX

universe) with max time 22ms (no delay visible)

The multiple receivers are connected to the DMX host in a daisy-chain manner and

every packet goes through every receiver.

Very simple protocol – only 8bit data one after another

83

7x DMX channels

0 Lamp Intensity

1 Rotation X Axis (Course)

2 Rotation X Axis (Fine)

3 Tilt Y Axis (Course)

4 Tilt Y Axis (Fine)

5 Color Selection

6 Gobo SelectionLamp example

STEVAL-ILL030V1 - descriptionRef. design and DMX512 communications protocol algorithm based on

STM32• Follows DMX512 2008 Standard as well as timing constraints

• Configuration of a single board mode as transmitter, receiver or standalone

• LED Intensity Control using a 120Hz PWM from 0% to 100%

• Connection to multiple receivers up to 512 to a single host controller

• False packets rejection, reset sequence timing checking

• Two on-board 3W LEDs and jumper option for driving external LEDs

Typical Applications:

stage lighting TheatersChoreographic lighting automatic light systems

Documentation:• UM1004 (user manual) DMX512 based LED lighting solution

• UM0792: Demonstration firmware for the DMX-512 communication protocol transmitter based on the

STM32F103Zx

• UM0791: Demonstration firmware for the DMX-512 communication protocol receiver based on the STM32F103Zx

• SW code (.hex) available with the board. The application source (IDE IAR Embedded Workbench) is available

only on request and it is covered by license agreement.

Board Purpose:Make the DALI communication available also on STM8 microcontrollers and have a simple demonstrator. Allow targeting medium/small size customers for lighting control

Key Product:

STM32F103 LDS3985M33R (voltage reg) STCS1APUR ESDAULC6-3B6 (USB protection) STBP120AVDK6F (voltage prot.) ST485ABDR

DALI overview 1/3

What is DALI ?

DALI = Digital Addressable Lighting Interface for remote control of lighting devices (dimming, automatic on/off switching…)

DALI advantages:

simple wiring: use standards electrical installation cables (no special communication cables), no special wiring topology

simple installation: cable polarity independency, light source addressing

digital host control – use low cost microcontrollers on light source side (minimize light source price)

DALI MEMBERS: ABB - ALTENBURGER ELECTRONIC - BAG - B.E.G. - BTICINO -CABA - CEAG - DELMATIC - DIAL - DYNALITE - ECKERLE - eldoLED - ELTAM EIN HASHOFET - ERC - ERCO - ETAP - EUTRAC - FIFTH - GEWISS - GITRONICA -GERARD LIGHTING - HADLER - HELVAR - HÜCO - INFRANET PARTNERS - INSTA - LIGHTOLIER - LUTRON - MACKWELL - ME ELECTRONIC PRODUCTS LTD. -NIKO - OSRAM - PHILIPS LIGHTING - SANDER - SCEMTEC - SIMMTRONIC -SPITTLER - SVEA - TCI - TRIDONIC - UNIVERSAL LIGHTING TECHNOLOGIES -VOSSLOH-SCHWABE - WAGO- XAL GmbH- ZUMTOBEL

85

Example of DALI devices connection:

86

• Example of DALI wiring:

DALI overview 2/3

Typical application

A single control cable can be used to control several

different groups of lamps.

87

Group 1:

Halogen lamp on table

Group 2:

Circular Fluorescent Lamps

Group 3:

Halogen lamp on the walls

Group 4:

Halogen lamp near white Board

Group 5:

Halogen lamp behind

DALI overview 3/3

DALI Implementation

“Gateway” “Ballast controller”

Target of this marketing package

STEVAL-ILM001V1 - descriptionDALI communication interface - plug-in module for STM8S-DiscoverySW Library

• DALI physical layer (GPIO toggling)

• DALI stack

• New DALI standard compatible

• Example for STM8S-DISCOVERY

HW module

• Isolated DALI interface

• Level translation for microcontroller

• Current consumption limiter

Typical Applications: Home/building automation Lighting

Documentation:UM1032 (board) soon to be published

AN3298 (SW Library) soon to be published

SW code soon on www.st.com/stm8s -> Resources -> Firmware

Board Purpose:Make the DALI communication available also on STM8 microcontrollers and have a simple demonstrator. Allow targeting medium/small size customers for lighting control

Key Product: STM8 family STN1HNK60 STN93003

Note: STM8S-DISCOVERY is not included in the STEVAL-ILM001V1

http://www.st.com/stm8s

SW Library

Main user application Example for STM8S-Discovery

DALI stack layer DALI commands implementation

HW independent (easily portable to STM32)

IO pin driver Physical and link layer of DALI interface (bit timing, bus error

recovery control, DALI frames transmission/reception)

Occupied resources:

2 GPIO pins – selectable (RX and TX) + 1 GPIO interrupt

1 Timer4 (DALI protocol timing) + 1 Timer interrupt

90

HW interface module

91

Current limiter

bipolar STN930003

Supply

selection

Transmitter

mosfet STN1HNK60

Bridge for

bipolar

connection

Driving Fluorescent Lamps

Analog ballasts

without power factor

control

(CFLs)

Analog ballasts with

power factor controlAdvanced digital ballasts

Self oscillating

(BIPOLARS)

Analog Control

(L6520 + MOSFET)

(L6520 + BIPOLARS)

Separate PFC part

(L6562A + L6574 + MOSFETs)

(L6562A + L6520 + MOSFET)

Combo solution

(L65685E + MOSFETs)

Separate PFC part

(TD22x + L638x + MOSFETs +

STM8)

Combo solution

(L6382 + STM8)

92

93

L6520 – New integrated ballast controller

10 : (1,1)

RHBCS

H.V.

Rpre

CRES

Ccp

CBLOCK

LRES

Cvcc

RE1

RE2

DZ2DZ1

HS

LS

Rst-up

2

3

4

8

EOL

PWM_det

VCC

LSD

L65207

HBCS6

HSD

5GND

1FPRE

ROUT2

ROUT1

PFC L6562A,

passive PFC or

directly from the

main

• The L6520 can work directly from the rectified main, with a passive

PFC or with the active PFC L6562A for the best performances

Pulse Transformer

94

L6520 – New integrated ballast controller

1 : (1,1)

RHBCS

H.V.

Rpre

CRES

Ccp

CBLOCK

LRES

Cvcc

RE1

RE2

DZ2DZ1

HS

LS

Rst-up

ROUT2

2

3

4

8

EOL

PWM_det

VCC

LSD

L65207

HBCS6

HSD

5GND

1FPRE

ROUT1

• No change from BJTs to MOSFETs

application apart form the Pulse Transformer

95

Internal Block Diagram

End Of Life

Hard Switching

Storage time

Programmable

Preheating

Current Control

Circuit

Drivers

V supply, UVLO, startup

• The digital core allows to integrate all the functions and protections, minimizing

the number of external components

THE END

THANK YOU !

2 STMicroelectronics LED Solutions

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Transcript of 2 STMicroelectronics LED Solutions