HV9925

HV9925 Initial Release Programmable-Current LED Lamp Driver IC with PWM Dimming Features  Programmable Output Current to 50mA  PWM Dimming / Enable  Universal 85-264VAC Operation  Fixed OFF-Time Buck Converter  Internal 500V Power MOSFET www.DataSheet4U.com  Over Temperature Protection with Hysteresis General Description The HV9925 is a pulse width modulated (PWM) high-efficiency LED driver control IC with PWM dimming capabilities. It allows efficient operation of high brightness LED strings from voltage sources ranging up to 400VDC. The HV9925 includes an internal high-voltage switching MOSFET controlled with a fixed off-time TOFF of approximately 10µs. The LED string is driven at constant current, thus providing constant light output and enhanced reliability. Selecting a value of a current sense resistor can externally program the output LED current of the HV9925. The peak current control scheme provides good regulation of the output current throughout the universal AC line voltage range of 85 to 264VAC or DC input voltage of 20 to 400V. The HV9925 is designed with a built in thermal shutdown to prevent excessive power dissipation in the IC. Applications  Decorative Lighting  Low Power Lighting Fixtures Typical Application Circuit ~ AC ~ BR1 L1 CIN CO LEDN D1 LED1 6 Enable 3 4 CDD Drain PWMD 7 Drain 8 Drain HV9925 VDD RSENSE U1 GND 1 RSENSE 2 NR021506 1 HV9925 Ordering Information DEVICE HV9925 -G indicates package is RoHS compliant (‘Green’) Package Opt...