AOZ1083 查看數據表（PDF） - Alpha and Omega Semiconductor

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AOZ1083

2A Simple Buck Regulator

Alpha and Omega Semiconductor 

AOZ1083

1.2 A Buck LED Driver

General Description

The AOZ1083 is a high efficiency, simple to use,

1.2 A buck HB LED driver optimized for general lighting

applications. The AOZ1083 operates from a 3 V to 26 V

input voltage range and provides up to 1.2 A of

continuous LED current. The 280 mV LED current

feedback voltage minimizes the power dissipation of the

external sense resistor. The fixed switching frequency of

1.5 MHz PWM operation reduces inductor and capacitor

sizes.

The AOZ1083 is available in a tiny SOT23-6L package.

Features

z Up to 26 V operating input voltage range

z 240 mΩ internal NMOS

z Up to 95 % efficiency

z Internal compensation

z 1.2 A continuous output current

z Fixed 1.5 MHz PWM operation

z Internal soft start

z 280 mV LED current feedback voltage with ±5 %

accuracy

z Cycle-by-cycle current limit

z Short-circuit protection

z Thermal shutdown

z Small size SOT23-6L

Applications

z Point of load DC/DC conversion

z Set top boxes

z DVD drives and HDD

z LCD Monitors & TVs

z Cable modems

z Telecom/Networking/Datacom equipment

Typical Application

VIN

C1

4.7µF

C3

VIN

BS

DIM

LX

AOZ1083

FB

GND

L1

2.2µH

LED1

RS

VOUT

C2

10µF

Rev. 1.0 July 2011

Figure 1. 1.2 A Buck HB LED Driver

www.aosmd.com

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