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Numéro de référence | HV9964 | ||
Description | CCM Boost LED Driver | ||
Fabricant | Supertex | ||
Logo | |||
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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Pages | Pages 12 | ||
Télécharger | [ HV9964 ] |
No | Description détaillée | Fabricant |
HV9961 | LED Driver ICs | Supertex |
HV9963 | Closed Loop LED Driver | Supertex |
HV9963NG-G | Closed Loop LED Driver | Supertex |
HV9964 | CCM Boost LED Driver | Supertex |
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TSPC106 | PCI Bus Bridge Memory Controller | ATMEL |
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