HV9910C Datasheet, PDF (1/8 Pages) Supertex, Inc – The HV9910C is an open loop, current mode, control LED driver IC.

Supertex inc.
HV9910C
Universal High Brightness
LED Driver
Features
►► Switch mode controller for single switch LED
drivers
►► Enhanced drop-in replacement to the HV9910B
►► Open loop peak current controller
►► Internal 15 to 450V linear regulator
►► Constant frequency or constant off-time operation
►► Linear and PWM dimming capability
►► Requires few external components for operation
►► Over-temperature protection
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
General Description
The HV9910C is an open loop, current mode, control LED driver
IC. The HV9910C can be programmed to operate in either a
constant frequency or constant off-time mode. It includes a
15 – 450V linear regulator which allows it to work from a wide
range of input voltages without the need for an external low
voltage supply. HV9910C includes a TTL compatible 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 linear dimming of the LED current. As opposed to
the HV9910B, the HV9910C is equipped with built-in thermal-
shutdown protection.
The HV9910C is ideally suited for buck LED drivers. Since
the HV9910C operates in open loop current mode control, the
controller achieves good output current regulation without the
need for any loop compensation. Also, being an open loop
controller, PWM dimming response is limited only by the rate
of rise of the inductor current, enabling a very fast rise and fall
times of the LED current. The HV9910C requires only three
external components (apart from the power stage) to produce
a controlled LED current making it an ideal solution for low cost
LED drivers.
Typical Application Circuit
C_IN
C_O
D1
C_DD
VIN
VDD
HV9910C
LD
GATE
L1
Q1
PWMD
RT
CS
GND
R_OSC
R_CS
Doc.# DSFP-HV9910C
NR041813
Supertex inc.
www.supertex.com