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OB3372

High Power Dual output LED Driver


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OB3372 pdf
OB3372
High Power Dual output LED Driver
GENERAL DESCRIPTION
The OB3372 is a high power dual output LED
driver optimized for large size LED backlighting
application. It integrates two independent boost
converters, providing a high performance and high
reliability LED backlighting solution.
It incorporates two boost converters operating in
current mode PWM control at fixed frequency. The
operation frequency is programmed from 100 kHz
to 600 kHz by setting an external resistor at RT
pin.
The OB3372 can be configured for Master-Slave
operation to support multi-channel applications.
The voltage across LED current sense resistor is
regulated to about 600mV to reduce power loss
and improve efficiency.
The external PWM dimming mode is supported.
The PWM dimming signal is injected externally
from DIM pin.
The OB3372 offers comprehensive protection
such as power MOSFET over current protection
(OCP), output over voltage protection (OVP), IC
power supply under voltage lockout (UVLO), and
LED open & short protection.
FEATURES
„ High Power Dual Output PWM Control
„ 8V to 35V Input Voltage Range
„ Master/Slave Synchronization Capability
„ Programmable 100kHz~600kHz Operation
Frequency
„ Programmable Slope Compensation
„ External PWM Dimming Mode
„ Over Voltage Protection
„ Over Current Protection
„ Under Voltage Lockout (UVLO)
„ LED Open Protection
„ LED Short Protection
APPLICATIONS
„ LCD TV
„ LCD Monitor
„ Flat panel display
TYPICAL APPLICATION
L2
D2
VIN
GND
ENA
DIM
CIN
SYNC
Fault
Driver
Circuit
Q5
L1
RSC
RRT
CCMP1
CCMP2
CHCP
1 SC
VIN 20
2 RT
GATE2 19
3 CMP1
GATE1 18
4 CMP2
GND 17
OB33725 HCP
6 SYNC
CS2 16
CS1 15
7 ENA
LSD2 14
8 DIM
FB2 13
9 OVP1
LSD1 12
10 OVP2
FB1 11
CVIN
Q2
Q1
RCS1
RCS2
D1
ROVP2A
ROVP2B
CO2
ROVP1A CO1
ROVP1B
Q3
RFB1
Q4
RFB2
Figure1: OB3372 Typical Application Schematic
©On-Bright Electronics
Confidential
-1-
Preliminary Datasheet
OB_DOC_DS_337202



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OB3372 pdf
OB3372
High Power Dual Output LED Driver
Absolute Maximum Ratings
Parameter
Vin Input Voltage to GND
GATE / LSD to GND
I/O (except GATE/LSD) to
GND
Operating Ambient Temp. TA
Operating Junction Temp. TJ
Min/Max Storage Temp. Tstg
Lead Temp. (10 Sec)
Value
-0.3V to 40V
-0.3V to 40V
-0.3V to 7V
-20~ 85
-40 ~150
-55 ~150
260
Note: Stresses beyond those listed under “absolute maximum
ratings” may cause permanent damage to the device. These
are stress ratings only, functional operation of the device at
these or any other conditions beyond those indicated under
“recommended operating conditions” is not implied. Exposure
to absolute maximum-rated conditions for extended periods
may affect device reliability.
Recommended Operating Range
Parameter
Vin Voltage
Operating Frequency
Value
8V to 35V
100k~600k
Ordering Information
Part Number
OB3372KP
OB3372LP
Description
SOP20, pb-free in tube
SSOP20, pb-free in tube
Marking Information
Y:Year Code
WW:Week Code(01-52)
ZZZ:Lot Code
L:SSOP20 Package
P:Pb-free Package
S:Internal Code(Optional)
©On-Bright Electronics
Confidential
-2-
Preliminary Datasheet
OB_DOC_DS_337202



Part Number OB3372
Description High Power Dual output LED Driver
Maker On-Bright - On-Bright
Total Page 13 Pages
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