KA7525B 查看數據表（PDF） - Fairchild Semiconductor

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KA7525B

Power Factor Correction Controller

Fairchild Semiconductor 

Application Circuit(#1)

KA7525B

AC Input

input filter

0.1uF

PBP204 390K

L

IN4004

3.3Ω Idet

+

68uF

22K

IN4937

IRF830

+

47uF/450V

0.5Ω/1W

LOAD

1M

5.1K

5K

1.8M

10K

Vcc

8

IN4148

33Ω

10Ω

2.5V Ref

Vcc

+ 2.1V

36V

-

UVLO

10V

Internal

Bias

Drive

Output

Idet

5

+

7.5V

-

Zeror Current

1.8V Detector

Timer R

S

Q

CS Only KA7525B

4

1.24V

-

+

Current Sense

Comparator

Vref

R

Delay

(KA7525)

Over Voltage

Protection

+

1.8V

-

MULT

3

Vm1

0 ~ 2V

Vmo

Multiplier

0.01uF

K=

Vmo

Vm1× (Vm2 - Vref)

-

+

Vm2

Vref ~ Vref + 1V

+

Vref

-

Vea(-)

Error Amp

6

GND

2

EA OUT

7

OUT

INV

1

0.1uF

13

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