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Application Note 34

VOUT +12V, 16A

+ C22 R22

C23

R25

R24

R26

+ C21

R23

U2

SR1

R18

L1

C24

R17

R16

D7

D11

C25

T2

D6

T3

D5

R20

R15

Q2

Q3

C20

C9

R7

R8

R10

R14

+ C13 C14 C15 C16 C30

R11

C8

+ C5

RT

D9

D10

C4

D8

D1

Q1

R19

R21

C17

C7

C6

824

16 15 14 13 12 11 10

VEAO VFB REF VCC VO1 VO2 GND

ILIM 9

D2

R30

+ C12

R12

ML4

IEAO IAC ISENSE VRMS SS VDC RAMP1

1 2 3 4 5 6 7

8 RAMP2

R27

C11

C10

CT

T1

D4

D3

C3

C19

C2

R2

R3

R4

R1

AC INPUT 80 TO 264V

C1

Z1

Z3

Z2

Z4

R5

Figure 6. A 200W Off-Line PFC/PWM Power Converter with Synchronous Switching.

REV. 1.0 11/17/2000

5

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