Product Specification

Low Cost Green-Mode PWM Controller for Flyback Converters

SG5701

© System General Corp.

- 2 -

www.sg.com.tw

Version 1.0(IAO33.0025.B1)

Mar. 28, 2006

MARKING DIAGRAMS

PIN CONFIGURATION

ORDERING INFORMATION

Part Number

PWM Frequency

Package

SG5701TZ

70kHz

6-Pin SOT-26 (Lead Free)

SG5701DZ

70kHz

8-pin DIP-8 (Lead Free)

PIN DESCRIPTIONS

Pin No.

Name

DIP-8 / (SOT-26)

Type

Function

GATE

1 / (6)

Driver Output

The totem-pole output driver for driving the power MOSFET.

VDD

2 / (5)

Supply

Power supply.

NC

3

NC pin.

SENSE

4 / (4)

Analog Input

Current sense. This pin senses the voltage across a resistor. When the voltage reaches

the internal threshold, PWM output is disabled. This activates over-current protection.

This pin also provides current amplitude information for current-mode control.

RI

5 / (3)

Analog

Input/Output

A resistor connected from the RI pin to ground will generate a constant current source for

the SG5701. This current is used to charge an internal capacitor, to determine the

switching frequency. Increasing the resistance will reduce the amplitude of the current

NC

6

NC pin.

FB

7 / (2)

Analog Input

Feedback. The FB pin provides the output voltage regulation signal. It provides feedback

to the internal PWM comparator, so that the PWM comparator can control the duty cycle.

GND

8 / (1)

Supply

Ground.

: Lead Free

SOT-26

GND

FB

RI

GATE

VDD

SENSE

AAEMW

Null=Regular Package

SG5701DP

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DIP-8

RI

NC

FB

GND

SENSE

NC

VDD

GATE