Classic Inverter Boards for Lcd 160
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Transcript of Classic Inverter Boards for Lcd 160
Power Supply Solutionsfor small/medium/big size
LCD-PDP/TVBETO-PX
Content
Classical Approach:60W SMPS (<20”)200W SMPS (up to 30-32”)
Resonant Approach:70W SMPS (<20”)180W SMPS (up to 30”)500W SMPS (up to 50”LCD-TV, 42” PDP-TV
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60W LCD-TV Power Supply: Block Diagram
Vac
+12V
Feedback
Advanced PWM
Controller
Power Supply UnitEMI filter&
Bridge Rectifier
•Operation close to the boundary between CCM and DCM: variable operating frequency
•Zero Voltage/Zero Current Switching at turn-on achievable
•Less EMI generated
•Variable frequency spreads spectrum
•Stand-By function put into optional
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Accurate OCP and OVP circuit are building in the simple can be optional.
5A12VRemarksCurrent
Total Output Power: 60W
VoutSingle Output Voltage (Vout): Wide Input Voltage Range: 90-265VAC
60W LCD-TV Power Supply: Specifications
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L6565
60W LCD-TV Power Supply: Schematic
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60W LCD-TV Power Supply:Testing Report
87.4%264V
87.0%240V
83.2%100V
81.7%90V
No LoadStand By
Input PowerFL Eff.Input Voltage
Testing Results
0ANo Load
0.0416A (0.5W)Stand By
5AFull Load (FL)
12VOuput
Test Loading
Loading efficiency
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A 60W LCD-TV Power Supply
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L6565: Quasi-Resonant SMPS controller
• Current Mode Quasi-Resonant PWM controller
• Micropower Start-up Current (40µA typ.)
• Low Quiescent Current (3mA typ.)• ZCD input for QR operation/external
synchronization• Frequency Foldback function• Line Voltage Feedforward function• Pulse-by-pulse overcurrent
protection• 2nd overcurrent level with Hiccup-
mode operation• Disable function• Internal RC filter on Current Sense• Package: Minidip and SO8
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QR Conversion:Quasi-Resonant Concept
Vin
Cin
Lm
Llk
Cd
VoutLp
Ls
VDS
ZVS condition: Vin ≤ VR
Operation close to the boundary between CCM and DCM: variable operating frequencyZero Voltage/Zero Current Switching at turn-on achievableLess EMI generatedVariable frequency spreads spectrum
Lp & Cd
Llk & Cd
Vin
t
VDS
VR
Ip
Pri Sec
TFW
T = 1/ fsw
TON Tv
IPKp
IPKs
ZVSNO ZVS!
VDS @ Vin2 >Vin
Vin2
Ip @ Vin2 >Vin
Is @ Vin2 >Vin
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EMC filter &Bridge Rectifier
DC DCconv.
+5V
+24V
+12V
Feedback
PFC+PWM+AuxL6562+L5991
+L6590
+5V standby
Vac
200W LCD-TV Power Supply: Block Diagram
Power Supply Unit•PFC200W critical control mode with ZCD function for a cost-effective application
•Main Converter200W FlybackConverter for middle size LCD-PDP/TV application
•Standby10W Flybackconverter with build-in mosfet PWM controller and circuit to switch off
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200W LCD-TV Power Supply:Specifications
5V output use DC-DC converter which can be put in optional.
6A3A2A2A
24V12V5V
5Vsb
RemarksCurrent
Total output Power : 200W
VoutMulti Output Voltages (Vout): Wide Input voltage range: 90-265VAC
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200W LCD-TV Power Supply: Schematic
Advanced PWM ControllerL6562+L5991+L6590
L5973D
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200W LCD-TV Power Supply: Testing Report
87.5%264V
86.8%220V
84.3%120V
81.6%90V
No LoadStand byInput PowerFL Eff.Input voltage
Testing result0000No Load
0.1000Stand by
2236Full load (FL)
5VSB5V12V24VOutputs
Test Loading
Loading efficiency
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200W LCD-TV Power Supply
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L6562 - Power Factor Corrector
• TRANSITION-MODE • PROPRIETARY MULTIPLIER DESIGN FOR MINIMUM THD OF AC INPUT CURRENT• LOW (<4 mA) QUIESCENT CURRENT• ON-CHIP FILTER ON CURRENT SENSE • 1% (@ Tj = 25 °C) INTERNAL REFERENCE VOLTAGE• -600/+800mA TOTEM POLE GATE DRIVER WITH UVLO PULL-DOWN AND VOLTAGE CLAMP
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L5991/A Primary PWM Controller
•CM 1MHz PWM Controller•Low Start-Up Current (<150 µA)•Low Quiescent Current (7mA typ.)•Standby function•Programmable 'Hiccup‘ ModeOvercurrent Protection•IN/OUT Synchronization•Precise Duty Cycle ControlLatched•Shutdown/Overvoltage Protection•Programmable Soft-Start•Internal 100 ns Leading EdgeBlanking on Current Sense•Package: DIP-16/SO-16
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L6590/A Fully Integrated Power Supply
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L6590 - Standby Function
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Contact Persons in Shenzhen MMX Technical Center
Application Engineer 23318601郭加总GuoTom
Senior Application Engineer 13692 222 12823348601郭青山GuoSam
Senior Application Engineer 23278601陈治国ChenRoy
Application Engineer 23118601彭 超PengChaoT/C Deputy Manager9752 127513602 616 66223068601方弘均BANGHG
A&P Lab, Industrial and Power TeamFax number:8601-2300Operator: 8601-2000
HONG KONGCHINA
FUNCTION / REMARKS
MOBILETELEPHONE
NO.CHINESE
NAMENAME
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A new approach:Half Bridge Resonant topology in LCD TV with ST L6598
controller
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LCD TV power supply configuration
AC Filter +Rectifier PFC stage DC-DC stage
DC-DC stage
L
N
Auxiliary Power
Main Power400Vdc Inverter
Audio
TunerLogic IC
5V
24V
18V9V
5V,3.3V
uP
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PFC stage in Main Power
Po of PFC
23” LCD TV
120W
26” LCDTV
160W
30” LCD TV
180W 220W 300W 460W 600W
40” LCD TV
50” LCD TV
42” PDPTV
250W
150W 400W
250W
L6561 or L6562 in Transition Mode
L6562 with Fixed Off-Time Control
L4981 in Continuous Conduction Mode
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DC-DC stage in main power
Step down converter
Step down converter
L6598
L5973, L4973
LM317
400Vdc Inverter
Tuner
Half BridgeResonantController
+
Synchronousrectification
Half Bridge Resonant Converter24V
18V
5V,3.3V
9V
Audio
L6997, L6910Step down converter
Logic IC
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Power rating for inverter, audio, tuner,and logic IC in LCD TV
Inverter : 30” - 12V/10A, 20V/6A, 24V/5A 42” - 24V/10A50” - 120V/3A
Audio : 12V/2.5A ( class D )18V/2A ( class AB )
Tuner : 8V, 9V, 30V, 33V
Logic IC : 5V/4A, 3.3V/3A
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L6598
With high efficiency, low EMI, cost effectiveness and high power density, it is a good solution for built-in LCD TV power supplies
Half Bridge Resonant Controller
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L6598 Main Features• Resonant controller up to 400KHz• High voltage rail up to 600V• Low start up current ( < 250uA )• Low quiescent current ( <2mA )• Latched / non latched device disable• 50% duty cycle half bridge driver• Programmable soft start• Integrated bootstrap diode• 350nS dead time• OP AMP for further protections
( Brown out, OTP …..)• Package : DIP16 / SO16
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L6598 internal block diagramInternal bootstrap diode
Latch
Non latch
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L6598 transformer topologies
For low output voltageand high output current
For high output voltageand low output current
Remark : a current doubler circuit can also be used to get a small ripple at the output
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Benefits of L6598-based power supply
• Reduction of switching losses because of zero voltage switching at turn-on of power MOS
• Reduced current in the half bridge power MOS• Reduced RMS current in secondary diodes• Reduced EMI filter dimension and cost• Reduced core loss• Reduced size and COST
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How to achieve ZVS in series resonant converter
Q2
Q1
DQ2
DQ1
L1
Q2
Q1
L1LOAD
T
LM
D1
D2
COUT
C1
C2
C1
C2
PFC output (+VBUS)
DQ2
DQ1
CQ2 CPIN
IL1
IQ1
IQ2
CQ1
G G
ICpin
LM N1
N2
N2
PFC output (+VBUS)
. Resonant topology
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Q1
Q2
“G”
IQ2
IQ1
IL1
IDT0 T1T8
VC1
T2
ICpin
T3 T4 T5
T6
T7 T8
Diode current
D2 D1
VIN*D
D1
+VBUS
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Diagram of 70W demo board with L6598
Half bridge resonant controller, L6598
PFC controller, L6561
Voltage and current controller, TSM`103
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Evaluation result of 70W ( 18V/3.8A) demo board ( L6561 + L6598 )
HalfHalfHalfHalfFullFullFullFullHalfFull
Load
88.4%35.64W2A17.82V40.3W255Vac88.4%35.64W2A17.82V40.3W220Vac
88%35.64W2A17.82V40.5W110Vac86.93%35.64W2A17.82V41W88Vac
91.%67.64W3.8A17.8V74.4W255Vac90.5%67.64W3.8A17.8V74.7W220Vac88.6%67.64W3.8A17.8V76.35W110Vac87.3%67.64W3.8A17.8V77.5W88Vac91.3 %35.6W2A17.8V39W400Vdc93.9 %67.64W3.8A17.8V72W400VdcEffPoIoVoPiVin
Highefficiency
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Diagram of 180W demo board with L6598
Input Voltage: 370V to 420V (PFC output)Output : 110V/1.2A, 24V/2AOutput power : 180W
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Efficiency of 180W demo board with L6598
Max Efficiency is 95% at the maximum output power of 180W
Pout : 180W
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500W demo board for LCD-PDP/TV power supplies
The demoboard is now under development andit will be available in Nov 2004
PFC stage( L4981B )
PWM stage( L6598 )
Aux. stage( L6590A )
L
N
Universal( 88 – 264 Vac ) 12V/7A
5V_aux/2A
120V/3.5A
Brown out
Overall Efficiency is estimated at abt. 91%
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References• Documents1. L6598 datasheet , February 20022. AN1300, Application Note, L6598 based 12V/3A
resonant application, October 20003. AN1660, Application Note, ZVS resonant converter
for consumer application using L6598 IC, March 20034. AN1673, Application Note, L6598; off line controller for
resonant converter, June 20035. AN 658, Application Note, resonant converter topology
1. 70W ( 18V/3.8A ) demo board with L6561 and L6598
• Hardware
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