UC3863A

LINEAR INTEGRATED CIRCUIT

UNISONICTECHNOLOGIESCO.,LTD

3 of 10

www.unisonic.com.tw

QW-R103-148.B



PIN CONFIGURATION



PIN DESCRIPTION

PIN NO.

SOT-26

SOP-8

HSOP-8

PIN NAME

PIN TYPE

DESCRIPTION

1

8

GND

P

Ground

2

7

FB

I

Feedback input pin. The PWM duty cycle is determined by

voltage level into this pin and SENSE pin input

3

5

RI

I

A resistor connected between RI and GND sets switching

frequency

4

4

SENSE

I

Current sense input pin. Connected to MOSFET current

sensing resistor node

5

2

P

Power supply.

6

1

GATE

O

The totem-pole output driver for driving the power MOSFET

-

3, 6

NC

-

No Connection



BLOCK DIAGRAM

GATE

FB

PWM COMP

OCP

UVLO

Reference voltage

Burstmode

Oscillator

GND

Latch

S

R

Q

Q

SENSE

Driver

LEB

Frequency

Hopping

Slope Compensation

Constant Power Limit

OTP

Logic

Control

OVP

1/8

2/7

5/2

6/1

4/4

3/5

RI