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Rev.2.3 Oct.09, 2019

AX3111



BLOCK DIAGRAM

Oscillator

START - UP

+

Thermal

Shutdown

Vss

SW

FB

COMP.

V CC

Current

limit

+

_

AMP

COMP.

CURRENT

SOURCE

BIAS

1.23V

REFERENCE

2.5 V

REGULATOR

COMP

0.815 V

EN / SS

-

PWM

Switched

Control Circuit

VGATE

OSC

5uA



PIN ASSIGNMENT

The packages of AX3111 is SOP-8L-EP; the pin assignment is given by:

( Top View )

1

2

3

4

8

7

6

5

FB

VGATE

SOP8L-EP

VCC

EN/SS

OSC

VSS

SW

COMP

SW

Name

Description

EN/SS ON/OFF Shutdown and Soft-start

pin

VSS

GND pin

VGATE

Driver GATE clamping pin. The

pin must connect a 1uF capacitor

to VCC

VCC

IC power supply pin

SW

Switch pin. Connect external

inductor and diode here.

FB

Feedback pin

COMP Compensation pin

OSC

Frequency Set Pin. The pin

connect a resistance to GND.