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HV9911 Datasheet(PDF) 1 Page - Supertex, Inc

Part # HV9911
Description  Switch-Mode LED Driver IC with High Current Accuracy
Download  14 Pages
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Manufacturer  SUTEX [Supertex, Inc]
Direct Link  http://www.supertex.com
Logo SUTEX - Supertex, Inc

HV9911 Datasheet(HTML) 1 Page - Supertex, Inc

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HV9911
Features
Switch mode controller for single switch drivers
o Buck
o Boost
o Buck-boost
o SEPIC
Works with high side current sensing
Closed loop control of output current
High PWM dimming ratio
Internal 250V linear regulator (can be extended
using external zener diodes)
Internal 2% Voltage Reference (0°C < T
A < 85°C)
Constant frequency or constant off-time operation
Programmable slope compensation
Enable & PWM dimming
+0.2A/-0.4A gate drive
Output short circuit protection
Output over voltage protection
Synchronization capability
Programmable MOSFET current limit
Soft start
Applications
RGB backlight applications
Automotive LED driver application
Battery Powered LED lamps
Other DC/DC LED drivers
General Description
The HV9911 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 or
constant off-time mode. The controller uses a peak current
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 constant frequency mode,
multiple HV9911s can be 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 for high
power applications. An internal 9 to 250V linear regulator
powers the IC, eliminating the need for a separate power
supply for the IC. HV9911 provides a TTL compatible, 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 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.
The HV9911 based LED driver is ideal for RGB backlight
applications with DC inputs. The HV9911 based LED lamp
drivers can achieve efficiency in excess of 90% for buck
and boost applications.
Typical Application Circuit - Boost
Switch-Mode LED Driver IC with High Current Accuracy
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
HV9911


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