HV9803 Datasheet, PDF (1/7 Pages) Supertex, Inc – LED Driver IC with Average-Mode Constant Current Control

Supertex inc.
HV9803
LED Driver IC
with Average-Mode Constant Current Control
Features
►► Fast average current control
►► Correction for propagation delay and offset voltage
►► Fixed off-time switching mode
►► Linear dimming input
►► PWM dimming input
►► Output short circuit protection with programmable
skip mode
►► Input under-voltage shutdown
Applications
►► Backlighting of LCD Panels
General Description
The HV9803 is an open loop average-mode current control
LED driver IC operating in a constant off-time mode. The IC
features ±2% current accuracy, tight line and load regulation
of the LED current without any need for loop compensation
or high-side current sensing. Its auto-zero circuit cancels the
effect of both the input offset voltage and the propagation
delay in the current sense comparator.
The HV9803 can be powered from a 7.0~13.2V supply. The
IC features fast PWM dimming response. The linear dimming
input LD can accept a reference voltage up to 2.5V.
The IC is equipped with a current limit comparator for
hiccup-mode output short circuit protection. It also features a
programmable input under-voltage shutdown.
Typical Application Circuit
+V_IN
7.0~13.2V
C_IN
C_DD
R₁
DIM
REF
VDD
PWMD GATE
HV9803
LD
CS
C_SKIP
R₂
UVLO
RT
GND
R_T
D₁
L₁
Q₁
R_CS
Doc.# DSFP-HV9803
NR012313
Supertex inc.
www.supertex.com