SG6858 datasheet(2/13 Pages) FAIRCHILD | Low-Cost, Green-Mode PWM Controller for Flyback Converters

2 page

Product Specification

Low-Cost, Green-Mode PWM Controller for Flyback Converters

SG6858

- 2 -

www.sg.com.tw • www.fairchildsemi.com

Version 1.2.1 (IAO33.0045.B2)

September 25, 2007

MARKING DIAGRAMS

PIN CONFIGURATION

ORDERING INFORMATION

Part Number

Pb-Free

Package

SG6858TZ

6-pin SOT-26

SG6858DZ

8-pin DIP-8

PIN DESCRIPTIONS

Pin No.

Name

DIP-8 SOT-26

Type

Function

GATE

Driver Output

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

VDD

Supply

Power supply.

No Connection

NC pin.

SENSE

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.

Analog

Input/Output

A resistor connected from the RI pin to ground generates a constant current source

used to charge an internal capacitor and determines the switching frequency.

Increasing the resistance reduces the amplitude of the current source and reduce the

switching frequency. A 95kΩ resistor, RI, results in a 50µA constant current II and a

70kHz switching frequency.

No Connection

NC pin.

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

Supply

Ground.

AAI: SG6858

m: Mask Version

w: Week code A~Z=W1~W26

A~Z=W27~W52

: Lead Free Package

SOT-26

GND

GATE

VDD

SENSE

D: D=DIP

P: Z=Lead Free

Null=Regular Package

XXXXXXXX: Wafer Lot

Y: Year; WW: Week

V: Assembly Location

DIP-8

GND

SENSE

VDD

GATE

AAImw

XXXXXXXXYWWV

SG6858DP

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