FP7155-3A Step Up LED Driver with Internal Switch(Buck-Boost升降压)

General Description
    The FP7155 is a current mode step up converter. It can driving single or multiple series connected LEDs with a 3A power switch. With 380KHz operating frequency, the external PWM components can all be small. The FP7155 include a high-side output current sensing circuit, which use an external resistor to set the LED’s current. Output current can also be adjusted by apply an external signal to the ‘ADJ’ pin. The ADJ pin will accept either a DC voltage or a PWM waveform to do dimming control. The PWM filter components are contained within the chip. Applying a voltage under 0.2V to the ADJ pin will turn off the output. The device is assembled in a SOP-8L package.

Features
□ 3A Switch Current
□ Internal 30V NDMOS Switch
□ Wide 5V to 24V operating Input Range
□ 25μA Shutdown Mode Current
□ Signal pin ON/OFF and Brightness Control
□ Internal Soft-Start
□ Programmable Over Voltage Protection to Limit Output Voltage
□ 0.12Ω Internal Power MOSFET Switch
□ Current Mode PWM with 380KHz Switching Frequency
□ Internal Dimming Filter

Applications
□ Low Voltage Halogen replacement LEDs
□ LED back-up lighting