ML4805 데이터 시트보기 (PDF) - Fairchild Semiconductor

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ML4805

Variable Feedforward PFC/PWM Controller Combo

Fairchild Semiconductor 

ML4805

PIN CONFIGURATION

ML4805

18-Pin PDIP (P18)

18-Pin SOIC (S18)

IEAO 1

18 VEAO

IAC 2

ISENSE 3

VRMS 4

SS 5

17 VFB

16 VREF

15 VCC

14 PFC OUT

VDC 6

RTCT 7

RAMP 1 8

13 PWM OUT

12 PGND

11 AGND

RAMP 2 9

10 ILIM

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 sense input

10 ILIM

PWM current limit sense input

11 AGND

Analog ground

12 PGND

Power ground

13 PWM OUT PWM driver output

14 PFC OUT PFC driver output

15 VCC

Positive supply (connected to an

internal shunt regulator).

16 VREF

Buffered output for the internal 7.5V

reference

17 VFB

PFC transconductance voltage error

amplifier input

18 VEAO

PFC transconductance voltage error

amplifier output

2

REV. 1.1 3/9/2001

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