HV9967B Datasheet, PDF (1/7 Pages) Supertex, Inc – Integrated LED Driver with Average-Mode Current Control

Supertex inc.
HV9967B
Integrated LED Driver
with Average-Mode Current Control
Features
►► 3% accurate LED current
►► Integrated 60V, 0.8Ω MOSFET
►► Low sensitivity to external component variation
►► Single resistor LED current setting
►► Fixed off-time control
►► PWM dimming input
►► Output short circuit protection with skip mode
►► Over-temperature protection
►► Available in compact 8-Lead MSOP and 8-Lead
DFN packages
Applications
►► DC/DC or AC/DC LED drivers
►► RGB backlighting drivers for flat panel displays
►► General purpose constant current source
►► Signage and decorative LED lighting
►► Chargers
General Description
The HV9967B is an average-mode current control LED driver IC
operating in a constant off-time mode.
The IC features an integrated 60V, 0.8Ω MOSFET that can be
used as a stand-alone buck converter switch, or connected as a
source driver for driving an external high-voltage depletion-mode
MOSFET. The HV9967B is powered through its switching output
when the integrated switch is off. Hence, the same external
MOSFET can be used as a high-voltage linear regulator for
powering the IC.
The LED current is programmed with one external resistor. The
average-mode current control method does not produce a peak-
to-average error, and therefore greatly improves current accuracy
and line and load regulation of the LED current without any need
for loop compensation or direct sensing of the LED current at a
high-voltage potential. The auto-zero circuit cancels the effects of
the input offset voltage and of the propagation delay of the current
sense comparator.
Typical Application Circuit
8.0 - 60VDC
+
C_IN
R_SENSE
U1
4
PWMD
1
SW
HV9967B
2
RSENSE
8
VDD
PGND AGND RT
3
7
6
R_T
D1
C_O
L1
C_DD
Doc.# DSFP-HV9967B
B060712
LED
String
Supertex inc.
www.supertex.com