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pt4107是一款工作與pwm方式的高效led驅動控制電路

universal high brightness led driver

general description 

the pt4107 is a pwm high-efficiency led driver control ic. it allows efficient operation of high brightness (hb) leds from voltage sources ranging from 18vdc up to 450vdc. the pt4107 controls an external mosfet at fixed switching frequency up to 300khz. the frequency can be programmed using a signal resistor. the led string is driven at constant light output and enhanced reliability. the output current can be programmed between a few milliamps and up to more than 1a.

the output current on an led string can be programmed to any value between zero and its maximum value by applying an external control voltage at the linear dimming control input of the pt4107. moreover, pt4107 provides a low-frequency pwm dimming input that can accept an external control signal with duty ratio of 0-100% and a frequency of up to a few kilohertz. features 

¨        >90% efficiency

¨        wide input range from 18v to 450v

¨        suitable for constant-current led driver

¨        applications from a few ma to more than 1a output

¨        led string from one to hundreds of diodes

¨        pwm low-frequency dimming via enable pin

¨        linear dimming via ld pin

¨        frequency jittering for better emi performance

¨        programmable over temp protection (otp) applications 

¨        dc/dc or ac/dc led driver applications

¨        rgb backlighting led driver

¨        general purpose constant current source

¨        signage and decorative led lighting

¨        automotive chargers typical applications