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HV9966 fiches techniques PDF

Supertex - Boost LED Driver

Numéro de référence HV9966
Description Boost LED Driver
Fabricant Supertex 
Logo Supertex 





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HV9966 fiche technique
Supertex inc.
HV9966
Boost LED Driver with
Low-side LED Wiring Fault Detection
Features
Switch mode controller for boost LED driver
High output current accuracy
Constant frequency operation
Hiccup mode protection for both short circuit
and open circuit conditions
LED wiring fault detection
Applications
RGB or white LED backlighting
General Description
The HV9966 is a current mode control LED driver IC designed to control a
boost LED driver in 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. The IC also provides
a disconnect switch gate drive output, which can be used to achieve good
PWM rise and fall times for the LED current using an external disconnect
FET.
The HV9966 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 kilohertz.
The HV9966 includes LED wiring fault detection function which turns off
the boost converter and sends a shutdown signal to the external power
supply in case the cathode of the LED string (or any tap in the LED string)
is shorted to ground. A dedicated power supply input keeps the wiring fault
detection circuitry armed even in the absence of the VCC supply.
Typical Boost Application Circuit
VBST
CIN
RIN
ZD1
CVIN
L1
Q1 D1
CO
RSC
RCS
ROVP1
R1
ROVP2
R2
12V
CVCC
VIN GT CS
VCC
GND
PWMD
HV9966
FLAG
RT DUTY COMP VDD
OVP
DR
DIS
FB
REF
R3
Q2
RT CC CDDRR1 RR2
RS
Doc.# DSFP-HV9966
A051412
Supertex inc.
www.supertex.com

PagesPages 9
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