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 8.0V to 450V linear regulator
Constant frequency or constant off-time operation
Linear and PWM dimming capability
Requires few external components for operation
General Description
The HV9910B is an open loop current mode control LED driver
IC. The HV9910B can be programmed to operate in either a
constant frequency or constant off-time mode. It includes an
8 – 450V linear regulator which allows it to work from a wide
range of input voltages without the need for an external low
voltage supply. The 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 linear
dimming of the LED current.
The HV9910B is ideally suited for buck LED drivers. Since
the HV9910B operates in open loop current mode control, the
controller achieves good output current regulation 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. The HV9910B 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.
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
Typical Application Circuit
C
IN
D1
C
DD
VDD
L1
VIN
C
O
HV9910B
LD
PWMD
RT
GATE
CS
GND
R
CS
Q1
R
T
SUPERTEX [ Supertex, Inc ]
