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Rev.1.4 Mar. 06, 2015

AX3112/A



BLOCK DIAGRAM

OSC.

START-UP and

Auto restart control

+

+

Thermal

Shutdown

CONTROL

+

DRIVER

COMP.

SW

COMP.

Current

limit

+

_

AMP

CURRENT

SOURCE

BIAS

1.23V

REFERENCE

2.5V

REGULATOR

SENSE1

1.25V

EN/CT

SENSE2

125mV

+

_

AMP

+

_

AMP

0.35V

SCP

OVP

Line

Compensation

VGATE

VCC

VSS

SENSE2

FB

1.1V



PIN ASSIGNMENT

The package of AX3112/A is SOP-8L-EP; the pin assignment is given by:

( Top View )

1

2

3

4

8

7

6

5

EN/CT

VGATE

SOP-8L-EP

VCC

VSS

FB

SENSE2

SW

SENSE1

SW

Name

Description

EN/CT ON/OFF and auto restart control

VSS

GND pin

VGATE

Driver gate clamping pin. The pin

must connect a 0.1uF capacitor to

VCC

VCC Operating voltage input

SW

Switch pin. Connect external inductor

and diode here

SENSE1 Current sense input1

SENSE2 Current sense input2

FB

Feedback pin