UC3800/B

Preliminary

LINEAR INTEGRATED CIRCUIT

UNISONIC TECHNOLOGIES CO., LTD

2 of 10

www.unisonic.com.tw

QW-R103-083.d

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M ARK I N G

UC3800

UC3800B

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PI N CON FI GU RAT I ON

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PI N DESCRI PT I ON

PIN NO.

PIN NAME

PIN TYPE

DESCRIPTION

1

GATE

O

Totem-pole gate driver output for power MOSFET.

2

P

Supply voltage

3

CS

I

Current sense input.

4

LNO

I

This pin is connected to the line input via two resistors to achieve line

voltage over protect function and Brownout

5

FB

I

The PWM duty cycle is determined by voltage level into this pin and the

current-sense signal at CS pin.

6

GND

P

Ground.

7

NC

8

HV

I

Connected to the line input or bulk capacitor via resistor for setup.