SN3350 LED驱动IC应用开发指南.pdf

SN3350 40V LED driver with internal switch General Description Features The SN3350 is a continuous mode inductive step-down Simple low parts count converter, designed for driving a single LED or multiple Internal 40V power switch series connected LEDs efficiently from a voltage source Wide input voltage range: 6V to 40V higher than the LED voltage. The chip operates from an input supply between 6V and 40V and provides an Up to 750mA output current （SOT89-5 package） externally adjustable output current of up to 750mA. High efficiency (up to 95% ) Depending upon supply voltage and external components, Typical 1200 ：1 dimming rate this can provide up to 30 watts of output power. Typical 5% output current accuracy The SN3350 includes an integrated output switch and a Single pin on/off and brightness control using DC high-side output current sensing circuit, which uses an voltage or PWM external resistor to set the nominal average output current. Up to 1MHz switching frequency Output current can be adjusted linearly by applying an Inherent open-circuit LED protection external control signal to the ADJ pin. The ADJ pin will Thermal shutdown protection circuitry accept either a DC voltage or a PWM waveform. This will Two packages available for different current provide eit