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HV9912 Datasheet(PDF) 1 Page - Supertex, Inc

Part # HV9912
Description  Switch-mode LED Driver IC With High Current Accuracy and Hiccup Mode Protection
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Manufacturer  SUTEX [Supertex, Inc]
Direct Link  http://www.supertex.com
Logo SUTEX - Supertex, Inc

HV9912 Datasheet(HTML) 1 Page - Supertex, Inc

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HV9912
Preliminary
Features
Switch mode controller for single switch
drivers
♦ Buck
♦ Boost
♦ Buck-boost and SEPIC
Works with high side current sensors
Closed loop control of output current
High PWM dimming ratio
Internal 90V linear regulator (can be
extended using external zener diodes)
Internal 2% voltage reference
(0°C < T
A < 85°C)
Constant frequency operation
Programmable slope compensation
Linear & PWM dimming
+0.2A/-0.4A gate drive
Hiccup Mode Protection for both short circuit
and open circuit conditions
Synchronization capability
Pin compatible with HV9911
Applications
LED backlight applications
General LED lighting applications
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 amplifier
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 Supertex’s HV9911.
It is compatible with existing HV9911 designs which have an input
voltage of less than 90V by changing R
OVP1, ROVP, and RT.
Typical Application Circuit - Boost
Switch-mode LED Driver IC
With High Current Accuracy and Hiccup Mode Protection
6
7
10
9
15
8
13
14
16
11
12
5
3
1
2
4
C
IN
C
DD
C
REF
R
R2
R
R1
R
L1
R
L2
R
T
R
SLOPE
R
SC
R
CS
R
OVP1
R
OVP2
C
O
D1
Q1
L1
Q2
Cc
Rs
VIN
VDD
GND
SC
RT
REF
CLIM
IREF
SYNC
PWMD
COMP
FDBK
FAULT
OVP
CS
GATE
HV9912
D2
VIN


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