Ver: 0.4 Preliminary

Apr 27, 2006

TEL: 886-3-5788833

http://www.gmt.com.tw

6

G5180

Global Mixed-mode Technology Inc.

Pin Description

PIN

NAME

I/O

FUNCTION

1

IN-

I

Error amplifier inverting input

2

SCP

-

Soft start and SCP setting capacitor connection

3

VCC

-

Power supply

4

BR/CTL

I

Output current setting and control

5

OUT

O

Output

6

GND

-

Ground

7

OSC

-

Capacitor and resistor connection pin for setting the oscillation frequency

8

FB

O

Error amplifier output

Block Diagram

4

5

SAWTOOTH WAVE

OSCILLATOR

SOFT START

SCP

OUTPUT DRIVER

CONTROL

REFERENCE

VOLTAGE

UVLO

6

2

8

1

+

+

7

3

+

+

+

+

1.25V

VCC

OSC

BR/CTL

OUT

GND

SCP

FB

IN-

0.5V

4

5

SAWTOOTH WAVE

OSCILLATOR

SOFT START

SCP

OUTPUT DRIVER

CONTROL

REFERENCE

VOLTAGE

UVLO

6

2

8

1

+

+

7

3

+

+

+

+

1.25V

VCC

OSC

BR/CTL

OUT

GND

SCP

FB

IN-

0.5V