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| HV9912 Datasheet, PDF (1/12 Pages) Supertex, Inc – Switch-mode LED Driver IC With High Current Accuracy and Hiccup Mode Protection | |||
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HV9912
Switch-mode LED Driver IC
Preliminary
With High Current Accuracy and Hiccup Mode Protection
Features
⺠Switch mode controller for single switch
drivers
⦠Buck
⦠Boost
⦠Buck-boost and SEPIC
⺠Works with high side current sensors
⺠Closed loop control of output current
⺠High PWM dimming ratio
⺠Internal 90V linear regulator (can be
extended using external zener diodes)
⺠Internal 2% voltage reference
(0°C < TA < 85°C)
⺠Constant frequency operation
⺠Programmable slope compensation
⺠Linear & PWM dimming
⺠+0.2A/-0.4A gate drive
⺠Hiccup Mode Protection for both short circuit
and open circuit conditions
⺠Synchronization capability
⺠Pin compatible with HV9911
Applications
⺠LED backlight applications
⺠General LED lighting applications
⺠Battery powered LED lamps
General Description
The HV9912 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 ampliï¬er
to control the output current in closed loop enabling high output
current accuracy (in the case of buck and buck-boost converters,
the output current can be sensed using a high side current sensor
like the HV7800). In the constant frequency mode, multiple HV9912
ICs can by synchronized to each other or to an external clock using
the SYNC pin. Programmable MOSFET current limit enables
current limiting during input under voltage and output overload
conditions. The IC also includes a 0.2A source and 0.4A sink gate
driver that makes the HV9912 suitable for high power applications.
An internal 90V linear regulator powers the IC eliminating the need
for a separate power supply for the IC. The IC also provides a
FAULT output, which can be used to disconnect the LEDs in case
of a fault condition using an external disconnect FET. HV9912 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 HV9912 includes
hiccup protection from both short and open circuits, with automatic
recovery after the fault condition is cleared.
The HV9912 is a pin compatible replacement to Supertexâs HV9911.
It is compatible with existing HV9911 designs which have an input
voltage of less than 90V by changing ROVP1, ROVP, and RT.
Typical Application Circuit - Boost
VIN
CIN
CDD
1 VIN
2 VDD
D2
L1
Q1
GATE 3
CS 5
RSC
CREF
RSLOPE
RT
4 GND
OVP 12
6 SC
7 RT
FAULT 11
HV9912
FDBK 16
10 REF
Cc
COMP 14
RL1
9 CLIM
RL2
RR1
15 IREF
RR2
PWMD 13
SYNC 8
D1
ROVP1
CO
RCS
ROVP2
Q2
Rs
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