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HV9803B fiches techniques PDF

Supertex - LED Driver IC

Numéro de référence HV9803B
Description LED Driver IC
Fabricant Supertex 
Logo Supertex 





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HV9803B fiche technique
Supertex inc.
HV9803B
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 Lighting
General Description
The HV9803B 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 HV9803B can be powered from a 7.0 to 16V supply. The
IC features fast PWM dimming response. The linear dimming
input LD can accept a reference voltage from 0 to 3.0V.
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
+VIN
7.0~16V
CDD
CIN
R1
DIM
REF
VDD
PWMD GATE
HV9803B
LD CS
CSKIP
R2
UVLO
RT
GND
RT
D1
L1
Q1
RCS
Doc.# DSFP-HV9803B
B032114
Supertex inc.
www.supertex.com

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