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| HV9911 Datasheet, PDF (1/9 Pages) Supertex, Inc – Switch-mode LED Driver IC with High Current Accuracy | |||
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HV9911
Initial Release
Switch-mode LED Driver IC with High Current Accuracy
Features
⺠Switch mode controller for single switch drivers
o Buck
o Boost
o Buck-boost
⺠Works with high side current sensing
⺠Closed loop control of output current
⺠High PWM dimming ratio
⺠Internal 9 to 250V linear regulator (can be extended
using external zener diodes)
⺠Internal 2% Voltage Reference (-40°C<TA<85°C)
⺠Constant frequency or constant off-time operation
⺠Programmable slope compensation
⺠Enable & PWM dimming
⺠+0.25A/-0.5A gate drive (VDD = 10V)
⺠Output short circuit protection
⺠Output over voltage protection
⺠Synchronization capability
⺠Programmable MOSFET current limit
⺠Soft start
Applications
⺠RGB backlight applications
⺠Automotive LED driver application
⺠Battery Powered LED lamps
⺠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 or buck-boost),
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 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 high side output current can be sensed by using the HV7800).
In the constant frequency mode, multiple HV9911s 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 0.25A source and 0.5A 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 HV9911 based LED driver is ideal for RGB backlight applications
with DC inputs. The HV9911 based LED Lamp drivers can achieve
efï¬ciency in excess of 90% for buck and boost applications.
Typical Application Circuit
VIN
CIN
L1
CREF
RL2
VIN
RT
RT
VDD
GND
RSLOPE
PWMD
GATE
SC
CS
HV9911
SYNC
OVP
REF
FAULT
CLIM
RL1
IREF
RR1
FDBK
COMP
D1
CDD
CO
ROVP1
Q1
RCS
RSC
ROVP2
Q2
RS
CC
RR2
1
NR011206
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