Supertex inc.
HV9961
LED Driver with Average-Mode
Constant Current Control
Features
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General Description
The HV9961 is an average current mode control LED driver
IC operating in a constant off-time mode. Unlike HV9910B,
this control IC does not produce a peak-to-average error, and
therefore greatly improves accuracy, line and load regulation
of the LED current without any need for loop compensation or
high-side current sensing. The output LED current accuracy
is ±3%.
Fast average current control
Programmable constant off-time switching
Linear dimming input
PWM dimming input
Output short circuit protection with skip mode
Ambient operating temperature -40OC to +125OC
Pin-compatible with the HV9910B
The IC is equipped with a current limit comparator for hiccupmode output short circuit protection.
Applications
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The HV9961 can be powered from an 8.0 - 450V supply.
A PWM dimming input is provided that accepts an external
control TTL compatible signal. The output current can be
programmed by an internal 275mV reference, or controlled
externally through a 0 - 1.5V dimming input.
DC/DC or AC/DC LED driver applications
LED backlight driver for LCD displays
General purpose constant current source
LED signage and displays
Architectural and decorative LED lighting
LED street lighting
HV9961 is pin-to-pin compatible with HV9910B and it can
be used as a drop-in replacement for many applications to
improve the LED current accuracy and regulation.
Typical Application Circuit
LED
Load
8.0 - 450VDC
1
VIN
5 PWMD
GATE 4
HV9961
6 VDD
7 LD
CS 2
GND
3
RT 8
RT
RCS
Sets
LED
Current
Supertex inc.
www.supertex.com
