Datasheet > AOZ1934

AOZ1934

更新时间： 2022-04-15 12:17:37

品牌	Logo	应用领域
美国万代 - AOS		驱动器
页数	文件大小	规格书
14页	776K
描述
High Efficiency Boost 20-, 30- LED Driver

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AOZ1934 数据手册

AOZ1934/1935

High Efficiency Boost 20-, 30- LED Driver

General Description

Features

The AOZ1934/5 is an ideal power solution for white LED

backlighting for medium to small size LCD panels. It is a

highly integrated step up DC-DC converter with input

voltage range from 2.7V to 25V, accommodating

1-, 2-, 3-, or 4-cell lithium ion batteries or 3.3V, 5V, 12V

or 20V regulated supplies. The AOZ1934/5 integrates a

40V power MOSFET as well as compensation and soft

start circuitry, which results in a simpler and smaller

solution with much fewer external components. A high

switching frequency (800kHz) allows the use of a smaller

inductor and capacitor to further reduce the solution size.

z Wide input range: 2.7V to 25V

z Drive up to 30 LEDs

– AOZ1934 up to 20 LEDs (10s2p)

– AOZ1935 up to 30 LEDs (10s3p)

z Up to 92% efficiency

z High frequency step-up converter (800kHz)

z Highly integrated solution

– Integrated 40V Power MOSFET

– Internal compensation and soft start

z Integrated current sinks:

Each of the regulated current sinks in the AOZ1934/5

provides 20mA factory programmed current. With a

maximum of 40V at the output of the step-up converter,

each string can connect up to ten LEDs in series, for a

total of 20 LEDs for AOZ1934 and 30 LEDs for AOZ1935.

AOZ1934 – 2 channels, AOZ1935 – 3 channels

– ±2% Typ. current accuracy

– 1.5% Typ. current matching

z PWM dimming with <1µs delay time

z Low operating quiescent current (500µA)

z LED open/short protection

The AOZ1934/5 is equipped with fast PWM dimming

control for wide dimming range and has an enable pin for

IC ON/OFF control. Various protection features are built

into the AOZ1934/5, including cycle-by-cycle input

current limit protection, output over-voltage protection,

LED fault (open or short) protection and thermal

shutdown protection. The leakage current in shutdown

mode is 0.1µA.

z Both internal fixed and external adjustable

Over-voltage protection

z Cycle-by-cycle inductor current limit (2.5A)

z 0.1µA shutdown current

z Green Package: 3 x 3 QFN-16

z -40°C to +85°C temperature range

The AOZ1934/5 is available in a 16-lead 3 x 3 x 0.75mm

thin QFN package.

Applications

z Netbook

z Tablet PCs

z GPS

z Portable media players

z 1-, 2-, 3-, 4-cell Li Ion LED applications

Rev. 1.0 August 2010

www.aosmd.com

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