HV9910V Datasheet, PDF (1/15 Pages) Microchip Technology – Universal High-Brightness LED Driver

HV9910B
Universal High-Brightness LED Driver
Features
• Switch mode controller for single switch LED drivers
• Enhanced drop-in replacement to the HV9910
• Open loop peak current controller
• Internal 8.0 to 450V linear regulator
• Constant frequency or constant off-time operation
• Linear and PWM dimming capability
• Requires few external components for operation
Applications
• DC/DC or AC/DC LED driver applications
• RGB backlighting LED driver
• Back lighting of flat panel displays
• General purpose constant current source
• Signage and decorative LED lighting
• Chargers
Description
HV9910B is an open loop, current mode control, LED
driver IC. This IC can be programmed to operate in
either a constant frequency or constant off-time mode.
It includes an 8.0 - 450V linear regulator which allows it
to work from a wide range of input voltages without the
need for an external low voltage supply. HV9910B
includes a PWM-dimming input that can accept an
external control signal with a duty ratio of 0 - 100% and
a frequency of up to a few kilohertz. It also includes a 0
- 250mV linear dimming input which can be used for lin-
ear dimming of the LED current.
HV9910B is ideally suited for buck LED drivers. Since
the HV9910B operates in open loop current mode con-
trol, the controller achieves good output current regula-
tion without the need for any loop compensation. PWM
dimming response is limited only by the rate of rise and
fall of the inductor current, enabling very fast rise and
fall times. HV9910B requires only three external com-
ponents, apart from the power stage, to produce a con-
trolled LED current. This makes HV9910B an ideal
solution for low cost LED drivers.
 2015 Microchip Technology Inc.
DS20005344A-page 1