Austriamicrosystems AS1344 42V DC升压转换方案

Austriamicrosystems 公司的AS1344是42V 带软起动的DC/DC升压转换器,工作电压从0.9V到3.6V,输出电压高达42V,并由外接分压电阻调整,在12V输出时可从1.5V VCC上输出30mA电流,效率高达85%,开关频率1MHz,静态电流22uA,关断电流0.1uA,主要用在OLED显示器电源,LCD偏压发生器,手机/绳电话,掌上电脑,PDA,手持终端,以电池为能源的设备等.本文介绍了AS1344的主要特性,方框图和典型应用电路以及LED电源电路图和推荐使用的电感,电容和二极管.

AS1344 42V, DC-DC Boost Converter with adjustable Softstart

The AS1344 boost converter contains a 1.4A internal switch in a tiny TDFN-10 3x3mm package. The device operates from a 0.9V to 3.6V supply, and can boost voltages up to 42V output. The output voltage can easily be adjusted by an external resistor divider.

The AS1344 uses a unique control scheme providing the highest efficiency over a wide range of load conditions. An internal 1.4A MOSFET reduces external component count, and a fixed high switching frequency (1MHz) allows for tiny surface-mount components.

The AS1344 also features power-OK circuitry which monitors the output voltage.

The device also offers a Softstart function which limits the current during startup. The current during startup can be easily adjusted with the value of RV. For RV =0Ω, there is no softstart.
..

查看全文