台湾启星TB99完全替代HV9910

tb99
led driver

description
the tb99 is a pwm high-efficiency led driver control ic. it allows efficient operation of high brightness (hb)
leds from voltage sources ranging from 8vdc up to 500vdc. the tb99 controls an external mosfet at fixed
switching frequency up to 500 khz. the frequency can be programmed using a single resistor. the led string is driven at
constant current rather than constant voltage, thus providing constant light output and enhanced reliability. the output
current can be programmed between a few milliamps and up to more than 1.0a.

features
µ >90% efficiency
µ 8v to 500v input range
µ constant-current led driver
µ applications from a few ma to more than 1a output
µ led string from one to hundreds of diodes
µ pwm low-frequency dimming via enable pin
µ input voltage surge ratings up to 500v

block diagram & typical application

pin description