UC3552

CMOS IC

UNISONICTECHNOLOGIESCO.,LTD

2 of 7

www.unisonic.com.tw

QW-R502-134.B

PIN CONFIGURATION

PIN DESCRIPTION

PIN NO. PIN NAME

I/O

DESCRIPTION

1

EO

I

Compensation pin for Error Amplifier

2

IN

I

Feedback pin with a typical reference voltage of 1.24V

3

SHDN

I

Shutdown control pin. The device will turn off when SHDN is low

4

GND

Ground

5

SW

O

Switch pin

6

Power supply pin

7

FREQ

I

Frequency select pin. Switch oscillator frequency to 640kHz when FREQ is low, and

1.3MHz when FREQ is high

8

SS

I

Soft-Start control pin. No soft-start when the pin is left open