HV9923 Datasheet, PDF (1/10 Pages) Supertex, Inc – 3-Pin Switch-Mode LED Lamp Driver ICs

HV9921/HV9922/HV9923
Initial Release
3-Pin Switch-Mode LED Lamp Driver ICs
Features
Constant Output Current:
o HV9921 – 20mA
o HV9922 – 50mA
o HV9923 – 30mA
Universal 85-264VAC Operation
Fixed OFF-Time Buck Converter
Internal 500V Power MOSFET
Applications
Decorative Lighting
Low Power Lighting Fixtures
General Description
The HV9921/22/23 are pulse width modulated (PWM)
high-efficiency LED driver control ICs. They allow efficient
operation of LED strings from voltage sources ranging up
to 400VDC. The HV9921/22/23 include an internal high
voltage switching MOSFET controlled with fixed off-time T_OFF
of approximately 10µs. The LED string is driven at constant
current, thus providing constant light output and enhanced
reliability. The output current is internally fixed at 20mA for
HV9921, 50mA for HV9922, and 30mA for the HV9923. 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.
Typical Application Circuit
HV9921/22/23
1
NR092005