ML4827

14

Figure 7. 100W Power Factor Corrected Power Supply, Designed Using Micro Linear Application Note 33.

AC INPUT

85 TO 265VAC

C1

470nF

ML4827-1

F1

3.15A

R5

300m

Ω

1W

BR1

4A, 600V

D12

1N5401

D13

1N5401

R2A

357k

Ω

R2B

357k

Ω

R3

75k

Ω

R4

13k

Ω

R1A

499k

Ω

R1B

499k

Ω

R12

27k

Ω

C6

1nF

C7

220pF

R11

750k

Ω

C19

1µF

C2

470nF

R27

39k

Ω

2W

C18

470pF

R6

41.2k

Ω

R10

6.2k

Ω

C11

10nF

C3

470nF

C30

330µF

R21

22

Ω

C4

10nF

D1

8A, 600V,

"FRED" Diode

C5

100µF

R14

33

Ω

D10

1N5818

D8

1N5818

R7A

178k

Ω

R7B

178k

Ω

C12

10µF

D3

BYV26C

Q1

IRF840

Q2

IRF830

C13

100nF

C14

1µF

IEAO

IAC

ISENSE

VRMS

SS

VDC

RAMP 1

RAMP 2

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

VEAO

VFB

VREF

VCC

PFC OUT

PWM OUT

GND

DC ILIMIT

Q3

IRF830

R15

3

Ω

C20

1µF

R28

180

Ω

12VDC

L1

3.1mH

L2

33µH

C21

1800µF

C24

1µF

RTN

D11

MBR2545CT

D5

BYV26C

D6

BYV26C

C25

100nF

R17

33

Ω

R30

4.7k

Ω

D7

15V

R22

8.66k

Ω

R25

2.26k

Ω

R20

1.1

Ω

C15

10nF

C16

1µF

C31

1nF

R8

2.37k

Ω

C8

82nF

C9

8.2nF

C17

220pF

R19

220

Ω

R23

1.5k

Ω

10k

Ω

R24

1.2k

Ω

C22

4.7µF

TL431

R26

10k

Ω

MOC

8102

C23

100nF

R18

220

Ω

9W

T2

T1

L1: Premier Magnetics #TSD-734

L2: 33µH, 10A DC

T1: Premier Magnetics #TSD-736

T2: Premier Magnetics #TSD-735

Premier Magnetics: (714) 362-4211

such synchronized switching, the ripple voltage of the

first stage is reduced. Calculation and evaluation have

shown that the 120Hz component of the PFC’s output

ripple voltage can be reduced by as much as 30% using

this method.

TYPICAL APPLICATIONS

Figure 7 is the application circuit for a complete 100W

power factor corrected power supply. This circuit was

designed using the methods and topology detailed in

Application Note 33.