PFC ( Single Stage )

36

CRM PFC Controller Evaluation Board FAN7529/FAN6961 -Single Stage PFC for Power-LEDs

FAN7529/FAN6961 Reference Design • Reference #: FEBxxxx

• CRM PFC Topology

• Input : 90~264VAC / 47~ 63Hz

• Output : 24V/2A

Fairchild Single Stage PFC Solution Benefits • Over 90% Power Factor can be achieved by single power stage.

• Simple circuit configuration & design flexibility with flyback topology.

• Reduce board space & total BOM cost.

High efficiency about over 85% max. eff. External circuitry for CC function needed

over 90% power factor under universal input. CC performance follows external CC circuit performance

37

Power MOSFETs for Single Stage ( Flyback Type )

Power MOSFET for Single Stage ( Flyback Type ) RDS(ON)

BVdss Product Qg Typ. ID PD Part Number Package Polarity Max (ohm)

[ V ] Release [ nC ] [ A ] [ W ] @ VGS =10V

FQPF8N80C TO-220F N 800 Released 1.55 35 8 59

FQPF7N80C TO-220F N 800 Released 1.9 27 6.6 56

FQPF6N80C TO-220F N 800 Released 2.5 21 5.5 51

FQPF3N80C TO-220F N 800 Released 4.8 13 3 39

FQP8N80C TO-220 N 800 Released 1.55 35 8 178

FQP7N80C TO-220 N 800 Released 1.9 27 6.6 167

FQP6N80C TO-220 N 800 Released 2.5 21 5.5 158

FQP3N80C TO-220 N 800 Released 4.8 13 3 107

FQA10N80C_F109 TO-3P N 800 Released 1.1 45 10 240

FQA8N80C_F109 TO-3P N 800 Released 1.55 35 8.4 220

FQA7N80C_F109 TO-3P N 800 Released 1.9 27 7 198

Universal Input Input + EMI

LED Lighting (85 ~ 265 Vac) Filter

Load &

(Up to 100W) Rectifier Snubber

Plan for 800V Super-Junction MOSFET for higher Power

ZCD D

VCC Feedback Controller &

MOT Isolation

FB S

Rectifiers for Single Stage ( Flyback Type )

VRRM IF (AV) VFM trr (max) Product Classification Part Number PKG

[ V ] [ A ] [ V ] [ ns ] Release

RURP860 600 TO220 8 1.5 70 Released

FFPF10UP60S 600 TO220F 10 2.2 90 Released UltraFast

RURP1560 600 TO220 15 1.5 60 Released

RURP3060 600 TO220 30 1.5 60 Released

HyperFast FFP/PF04H60S 600 TO220/F 4 2.1 35 Released I / II

RHRD660/S 600 I/D PAK 6 2.1 30 Released

FFP/PF08H60S 600 TO220/F 8 2.1 35 Released

FFPF10H60S 600 TO220F 10 2.5 35 Released

RHRP1560 600 TO220 15 2.1 40 Released

RHRP3060 600 TO220 30 2.1 45 Released

Universal Input Input + EMI

LED Lighting (85 ~ 265 Vac) Filter

Load &

(Up to 100W) Rectifier Snubber

ZCD D

VCC Feedback Controller &

MOT Isolation

FB S

Concept of Single Stage PFC

Conventional Solution

1st Stage: PFC

2nd Stage: DC-DC Converter

Single Stage Solution

™ Isolation Flyback < 100W

™ Non-isolation Boost Buck-boost

< 250W Cuk Sepic

™ Parallel Operation> 250W

- Merits: Low-cost solution ( BOM reduction of 5 components )

- Demerits: Lower Power Factor, Higher rating components especially output capacitance.

Experimental Results ( 100W Single Stage PFC )

Universal Input Input + EMI

LED Lighting (85 ~ 265 Vac) Filter

Load &

(Up to 100W) Rectifier Snubber

Key Challenge Factor ZCD D

VCC

MO Isolation Main components

FB S - MOSFET: FCPF11N60

800V MOSFET needed - FRD: FFPF08H60S

- Controller: (modified) FAN7530

Specification

- Flyback-type Single stage PFC with CRM based constant voltage supply - 85V ~ 265 Vac input range

- Output voltage: 48V, 2.08A, 100W - Application: LED Lighting

Efficiency Continued..

90 Output Voltage (V) Line voltage

(AC) At Full load (100W) At Light load (5W) 88 85 48.2 48.8

115 48.1 48.5 86 145 48.0 48.3

175 48.0 48.3 84

205 48.0 48.3

82 235 48.0 48.3

265 48.0 48.3

80 90 120 150 180 210 240 270

Line Voltage (AC) ±1% regulation of output voltage

Input voltage (AC) Output Efficiency (%)

85 83.6

115 85.6

145 86.7

175 86.5

205 86.6

235 86.6

265 86.3

Power Factor Continued..

1.00

Input Voltage 0.96

0.92 Input Current

0.88 PF=0.997

90 120 150 180 210 240 270

Line Voltage (AC)

Input voltage (AC) Power Factor

85 0.997 PF=0.948

115 0.994

145 0.988

175 0.979

205 0.966

235 0.948

265 0.924 PF=0.924

Waveforms Continued..

Switching waveforms at 110Vac, 100W Switching waveforms at 220Vac, 100W

Id (5 A/div)

Vds (500 V/div)

2 ms/Div 2 ms/Div

Vgs (20 V/div)

Id (5 A/div) Vds (200 V/div)

4 us/Div 2 us/Div