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OB3372 Datasheet

High Power Dual output LED Driver

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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
On-Bright
On-Bright



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