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HV9963NG-G fiches techniques PDF

Supertex - Closed Loop LED Driver

Numéro de référence HV9963NG-G
Description Closed Loop LED Driver
Fabricant Supertex 
Logo Supertex 





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HV9963NG-G fiche technique
Supertex inc.
Closed Loop LED Driver
with Enhanced PWM Dimming
HV9963
Features
Switch-mode controller for single switch converters
Buck
Boost
Buck-boost and SEPIC
High output current accuracy
High PWM dimming ratio (>5000:1)
Internal 40V linear regulator
Internal ±2% voltage reference
Constant frequency operation with sync capability
Programmable soft start
10V GATE drivers
Hiccup mode protection for both short circuit and
open circuit conditions
General Description
The HV9963 is a current mode control LED driver IC designed
to control single switch PWM converters (buck, boost, buck-
boost or SEPIC) in a constant frequency mode. The controller
uses a peak current-mode control scheme (with programmable
slope compensation) and includes an internal transconductance
amplifier to accurately control the output current over all line and
load conditions. Multiple HV9963s can be synchronized to each
other or to an external clock using the SYNC pin. The IC also
provides a disconnect switch gate drive output, which can be
used to disconnect the LEDs in case of a fault condition using an
external disconnect FET. The 10V external FET drivers allow the
use of standard level FETs. The low voltage 5.0V AVDD is used to
power the internal logic and also acts as a reference voltage to set
the current level.
Applications
RGB or white LED backlighting
Battery powered LED lamps
Other DC/DC LED drivers
The HV9963 includes an enhanced PWM dimming logic (patent
pending) that enables very high PWM dimming ratios.
HV9963 also provides a TTL compatible, low-frequency 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 tens of kilohertz.
Typical Application Circuit
CIN
CPVDD
D2 (optional)
D1
Q1
CSC
RCS
ROVP1
CO
ROVP2
PVDD GT
VIN
CS
GND
PWMD
HCP SYNC
HV9963
SS COMP RT
OVP
FLT
FB
IREF
AVDD
RREF1
CHCP
CSS
CC RT
CAVDD
RREF2
Q2
RS
Supertex inc. 1235 Bordeaux Drive, Sunnyvale, CA 94089 Tel: 408-222-8888 www.supertex.com

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