Prema公司的PR4404是适用于0.5W/1W大功率LED的低压升压驱动器,能从单电池(1.2V/1.5V)提供高达150mA LED电流或从两节电池(2.4V/3.0V)提供高达300mA LED电流.因此,PR4404可广泛用在LED火炬,LCD屏背光,家庭照明和玩具.本文介绍了PR4404主要特性, 方框图, 典型应用电路, 测试电路, 手电筒应用电路, LED串驱动电路图以及PWM控制的LED驱动电路图.

Low Voltage Boost Driver PR4404 for 0.5W / 1W Power LEDs
The PR4404 is a step-up converter for white LEDs, operating with single battery cELl
supply (1.2/1.5V) at up to 150mA LED current or dual cell supply (2.4/3.0V) at up to
300mA LED current.
A minimum part count allows compact and cost-efficient solutions.
The converter can be switched on and off with a logic signal, which is useful e.g. for PWM
control, timer circuits etc.



PR4404主要特性:
minimum startup voltage 1.0V
supply by one or two battery cells
low number of external components
battery deep discharge protection
应用:
LED torches
LCD panel backlighting
home lighting
toys



图1. PR4404方框图




图2.PR4404典型应用电路



图3.PR4404测试电路

详情请见PDF文档

来源：Prema