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Supertex - CCM Boost LED Driver

Numéro de référence HV9964
Description CCM Boost LED Driver
Fabricant Supertex 
Logo Supertex 





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HV9964 fiche technique
Supertex inc.
HV9964
CCM Boost LED Driver with Sub-Microsecond
PWM Dimming and Open Loop Protection
Features
General Description
Switch-mode controller for single switch converters The HV9964 is a current mode control LED driver IC designed to
Boost
SEPIC
control single switch PWM converters (boost or SEPIC) in a constant
frequency mode. The controller uses a peak current-mode control
Current loop closed with sub-microsecond PWM scheme (with programmable slope compensation) and includes an
dimming pulses supports PWM dimming >20kHz internal transconductance amplifier to accurately control the output
High PWM dimming ratio (>10,000:1)
current over all line and load conditions. The IC also provides a load
Internal 40V linear regulator
switch gate drive output, which can be used to disconnect the LEDs
Internal ±2% voltage reference
Programmable constant frequency operation
Programmable slope compensation
Programmable soft start
in case of a fault condition using an external load switch. The 10V
external FET drivers allow the use of standard level FETs. The low
voltage 5V AVDD is used to power the internal logic and also acts
as a reference voltage to set the current level.
10V, +0.25A/-0.5A MOSFET gate drivers
The HV9964 features Supertex’ proprietary PWM dimming control
Hiccup mode protection for both short circuit and algorithm achieving a dimming pulse of a few hundred nanoseconds
open circuit conditions
from a continuous conduction mode (CCM) or discontinuous-
Latching protection from open loop
conduction mode (DCM) boost converter, while maintaining the
Active-Low, open-drain output to indicate a fault instantaneous LED constant current determined by the reference
condition
voltage input. This feature permits dimming frequency outside of
Applications
LED backlights for LCD Displays
the audible range. The feature can also yield a wide dimming ratio
in excess of 10,000:1 at low dimming frequency.
The HV9964 provides a full protection feature set, including output-
short and open-circuit protection with auto-restart, and latching
open-loop protection with an open-drain flag output.
The HV9964 is powered by a built-in 40V linear regulator.
Typical Boost Application Circuit
CIN L1
Q1 D1
CPVDD
RSC
RCS
ROVP1
CO
ROVP2
RT
PVDD VIN GT CS
RT
GND
OVP
FLT HV9964 DIS
PWMD
HCP SS COMP AVDD
IREF FB
CHCP
CSS
CC
CAVRDDR1
RR2
Q2
RS
Doc.# DSFP-HV9964
A100112
Supertex inc.
www.supertex.com

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