发布者：来自网络 发布时间：2010/1/14 阅读：8615次    关键字： FP7101B LED

FP7101B   2A Constant Current Buck Converter for Powering LEDs General Description Download     The FP7101B is a current-mode buck regulator with a built in internal 2A power MOSFET. lt provides a simple, high efficiency solution for driving high power LEDs. With a 0.2V reference voltage feedback control to minimize power dissipation, an external resistor sets the current as needed for driving various types of LEDs. Current mode operation provides fast transient response and eases loop stabilization. The FP7101B requires a minimum number of readily available external components to complete a 2A buck regulator solution. The device includes cycle-by-cycle current limiting and thermal shutdown protection. Additional features include user accessible EN/DIM pin for enabling and PWM dimming of LEDs. 　 ˙Data Sheet Features ˙2A Output Current ˙0.22Ω lnternal Power MOSFET Switch ˙Stable with Low ESR Output Ceramic Capacitors ˙Up to 90% Efficiency ˙25μA Shutdown Mode Current ˙Fixed 1MHz frequency ˙Thermal Shutdown ˙Cycle-by-Cycle Over Current Protection ˙Wide 4.75 to 23V operating lnput Range ˙Output Adjustable From 0.2 to 16V ˙Available SOP8 Exposed PAD ˙Under Voltage Lockout