FA3647 datasheet(2/21 Pages) FUJI

Part #	FA3647

Description	PWM control IC with light load power saving function For Switching Power Supply Control

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Manufacturer	FUJI [Fuji Electric]

Direct Link	http://www.fujielectric.co.jp/eng/fdt/scd

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2 / 21 page

FA3641P(N), FA3647P(N)

59

s Absolute maximum ratings (Ta=25˚C)

Item

Symbol

Test condition

Rating

Unit

Supply voltage

VCC1

Low impedance source (Icc >15mA)

30

V

VCC2

Internal ZD clamp (Icc < 15mA)

Self limiting

V

Output peak current

IOL

Sink current

+1.0

A

IOH

Source current

–0.5

A

FB pin input voltage

VFB

–0.3 to 5.0

V

REF pin output current

IREF

–10

mA

IS pin input voltage

VIS

–0.3 to 5.0

V

CS pin input current

ICS

2.0

mA

Total power dissipation

Pd

at Ta =25˚C

DIP

800

*1

mW

SOP

400

*2

Operating temperature

Topr

–30 to +85

˚C

Junction temperature

Tj

125

˚C

Storage temperature

Tstg

–40 to +150

˚C

s Block diagram

FA3641

FA3647

Note:

*1 Derating factor Ta > 25˚C: 8.0mW/˚C

Maximum power dissipation curve

*2 Derating factor Ta > 25˚C: 4.0mW/˚C

–30

25

85

125

0

Ambient temperature Ta [˚C]

400mW (SOP)

800mW (DIP)

Pin No. Symbol Function

Description

1

RT

Oscillator timing

Setting oscillation frequency

resistor

2

FB

Feedback

Input to PWM comparator

3

IS (+)/

Overcurrent

Input to overcurrent limiting

IS (–)

detection

function

4

GND

Ground

5

OUT

Output

Output for direct driving a

power MOSFET

6

VCC

Power supply

Power supply for IC

7

REF

Reference voltage

Reference voltage output

(5V)

8

CS

Soft-start and

Soft-start, ON/OFF and latch-

ON/OFF control

mode shutdown operations

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FA3647 Datasheet(PDF) 2 Page - Fuji Electric

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