HV9925

All voltages referenced to GND pin.
**The power dissipation is given for the standard minimum pad without a heat slug, and based on RJA=125°C/W. R_JA is the sum of the junction-tocase and case-to-ambient thermal resistance, where the latter is determined by the user's board design. The junction-to-ambient thermal resistance is R_JA= 105°C/W when the part is mounted on a 0.04 in2 pad of 1 oz copper, and RJA= 60°C/W when mounted on a 1 in2 pad of 1 oz copper.

The HV9925 is a pulse width modulated (PWM) high-effi ciency LED driver control IC with PWM dimming capabilities. It allows effi cient operation of high brightness LED strings from voltage sources ranging up to 400VDC. It includes an internal high-voltage switching MOSFET controlled with a fi xed off-time T_OFF of approximately 10s. 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. It is designed with a built in thermal shutdown to prevent excessive power dissipation in the IC.