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Allegro A6210谷电流模式控制降压稳压方案

关键词:电源管理 DC/DC转换器 A6210

时间:2009-07-16 16:21:00       来源:Allegro

Allegro公司的A6210是谷电流模式控制降压稳压器,开关频率高达2MHz,可以得到非常短的开启时间,非常适合需要高开关频率,高输入电压和低输出LED摆幅电压的地方如高亮LED和LED驱动模块. A6210输入电压从9V到46V,不需要输出电容,输出电流高达3A,而待机电流小于100uA,并具有热关断特性.亮度控制可通过DIS引脚的PWM来完成.本文介绍了A6210的主要特性,方框图案以及几中应用电路和推荐使用的元件数值和清单.

The A6210 is a buck regulator that uses valley current-mode control. This control scheme allows very short switch on-times to be achieved, making it ideal for applications that require high switching frequencies combined with high input voltages and low output LED span voltages.
Low system cost is accomplished through high switching frequencies of up to 2.0 MHz, allowing smaller and lower value inductors and capacitors. In addition, few external components are required through high levels of integration. Optimal drive circuits minimize switching losses.
The switching frequency is maintained constant, as the on-time is modulated by the input voltage. This feed-forward control ensures excellent line correction. The on-time is set by an external resistor pulled-up to the input supply.
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