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Numéro de référence | HV9963NG-G | ||
Description | Closed Loop LED Driver | ||
Fabricant | Supertex | ||
Logo | |||
1 Page
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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Pages | Pages 12 | ||
Télécharger | [ HV9963NG-G ] |
No | Description détaillée | Fabricant |
HV9963NG-G | Closed Loop LED Driver | Supertex |
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