下载
● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: 408-222-8888 ● www.supertex.com
HV9925
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
►
►
►
►
►
►
►
►
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.
Typical Application Circuit
Programmable-Current LED Lamp Driver IC
with PWM Dimming
页面指南
