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Rev.1.4 Sep.27, 2019

AX2012



BLOCK DIAGRAM

VCC

LX

Control and

Driver Logic

EN

Reference

1.238V

Soft Start

Current

Sense

Slope

Compensation

Oscillator

1.2MHz

FB

Error

Amplifier

Summing

Comparator

Thermal

Shutdown

Enable

Logic

GND

N-MOS

10ms

300mV

Shutdown

OVP

OV

UVLO



PIN ASSIGNMENT

The packages of AX2012 are TSOT-23-6L and TDFN-8L; the pin assignment is given by:

TDFN-8L (2*2)

1

2

3

4

5

6

7

8

GND

SW

(GND)

NC

FB

GND

VCC

OV

EN

Name

Description

GND Ground Pin

VCC Power Input Pin

OV

OVP Sense Pin

EN

Enable with Dimming Pin; Internal

Pull-Low; Logic High Active

FB

Feedback Pin; Put a Resistor to GND

to Setting the Current

NC

No Connect Pin

SW Switch Output Pin

(Top View)

TSOT-23-6L

3

2

6

4

1

GND

VCC

SW

OV

5

FB

EN