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SG6860

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

Fairchild Semiconductor 

Pin Configuration

Figure 3. DIP Pin Configuration (Top View)

Figure 4. SOT Pin Configuration (Top View)

Pin Definitions

Pin #

DIP

1

2

3

4

5

6

7

8

Pin #

(SOT)

(6)

(5)

--

(4)

(3)

--

(2)

(1)

Name

GATE

VDD

NC

SENSE

RI

NC

FB

GND

Description

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

Power Supply.

No Connection.

Current Sense. This pin senses the voltage across a resistor. When the voltage

reaches the internal threshold, PWM output is disabled, which activates over-current

protection. This pin also provides current amplitude data for current-mode control.

Reference Setting. A resistor connected from the RI pin to ground generates a

constant current source used to charge an internal capacitor and determine the

switching frequency. Increasing the resistance reduces the amplitude of the current

source and reduces the switching frequency. A 95kΩ resistor, RI, results in a 13µA

constant current, II, and a 70kHz switching frequency.

No Connection.

Feedback.

Ground. For ATX SMPS, it detects AC line voltage through the main transformer.

© 2008 Fairchild Semiconductor Corporation

SG6860 • Rev. 1.0.1

3

www.fairchildsemi.com

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