ML4801 查看數據表（PDF） - Fairchild Semiconductor

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ML4801

Variable Feedforward PFC/PWM Controller Combo

Fairchild Semiconductor 

ML4801

PIN CONFIGURATION

ML4801

16-Pin PDIP (P16)

16-Pin Narrow SOIC (S16N)

IEAO 1

16 VEAO

IAC 2

ISENSE 3

VRMS 4

SS 5

15 VFB

14 VREF

13 VCC

12 PFC OUT

VDC 6

11 PWM OUT

RTCT 7

10 GND

RAMP 1 8

9 RAMP 2

TOP VIEW

PIN DESCRIPTION

PIN NAME

1 IEAO

2 IAC

3 ISENSE

4 VRMS

5 SS

6 VDC

7 RTCT

8 RAMP 1

FUNCTION

PFC transconductance current error

amplifier output

PFC gain control reference input

Current sense input to the PFC current

limit comparator

Input for PFC RMS line voltage

compensation

Connection point for the PWM soft start

capacitor

PWM voltage feedback input

Connection for oscillator frequency

setting components

PFC ramp input

PIN NAME

FUNCTION

9 RAMP 2 PWM ramp current sense input

10 GND

Ground

11 PWM OUT PWM driver output

12 PFC OUT PFC driver output

13 VCC

Positive supply (connected to an

internal shunt regulator).

14 VREF

Buffered output for the internal 7.5V

reference

15 VFB

PFC transconductance voltage error

amplifier input

16 VEAO

PFC transconductance voltage error

amplifier output

2

REV. 1.1 3/9/2001

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