HV9925-08 Datasheet, PDF (1/10 Pages) Supertex, Inc – Programmable-Current LED Lamp Driver IC with PWM Dimming

HV9925
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 475V power MOSFET
► Over-temperature protection with hysteresis
Applications
► Decorative lighting
► Low power lighting fixtures
Typical Application Circuit
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 (T_OFF) of approximately 10.5µs. 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.
● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: [phone] ● www.supertex.com