Document
On-Bright Confidential to IVT
OB3362F
4 Channels High Performance LED Driver
GENERAL DESCRIPTION
The OB3362F is a highly integrated and high performance LED driver that optimized for LCD backlight application. It integrates a boost driver and 4 channels of current balancer that optimized to drives multi LED arrays, and thus provides a high performance LED backlight solution with minimized BOM count.
The OB3362F contains a PWM boost driver which uses current mode control and fixed frequency operation. The operation frequency can be programmed by setting external resistor value at RI pin.
The OB3362F integrates 4 channels current balancer with up to 200mA current capability per channel and it can achieve 3% matching accuracy among LED strings. The minimum voltage of current source is regulated to as lower as 350mV, which benefits the efficiency and improves the IC thermal performance.
The OB3362F supports external PWM dimming and internal burst dimming mode which allow flexible control of the backlight luminance. The LED current is directly modulated by external PWM duty cycle when PWM dimming mode is selected. The LED current can be adjusted by an external DC voltage when internal burst dimming mode is selected.
TYPICAL APPLICATION
FEATURES
10V gate drive, better MOS compatibility High Efficiency and Compact Size 6V to 30V Input Voltage Range 3% Matching Accuracy Between 4 LED
Strings Control Current 100KHz~600KHz Operating Frequency Internal/External PWM Dimming Very Low Standby Power Programmable Over Voltage Protection Under Voltage Lockout(UVLO) Open/Short LED Protection Thermal Shutdown
APPLICATIONS
LCD Monitor LCD TV Flat panel display
OB3362F is offered in 16-pin ESOP/DIP
Figure1: OB3362F Typical Application Schematic
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Preliminary Datasheet OB_DOC_DS_3362F00
On-Bright Confidential to IVT
OB3362F
4 Channels High Performance LED Driver
Absolute Maximum Ratings
Parameter Vin Input Voltage to GND
FAULT to GND
LEDX to GND
I/O to GND Operating Ambient Temp. TA Operating Junction Temp. TJ Min/Max Storage Temp. Tstg Lead Temp. (10 Sec)
Value -0.3V to 40V Vin-7V to Vin
-0.3V to 40V
-0.3V to 7V -20℃ ~ 85℃ 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 6V to 30V
100KHz to 600KHz
Ordering Information
Part Number OB3362FRP OB3362FHP OB3362FHPA
Description DIP16, Pb-free in Tube ESOP16, Pb-free in Tube ESOP16, Pb-free in T&R
Marking Information
©On-Bright Electronics
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Preliminary Datasheet OB_DOC_DS_3362F00
On-Bright Confidential to IVT
OB3362F
4 Channels High Performance LED Driver
Pin Configuration for OB3362F
ENA
DIM
GND RI
BFIS/ ET DMOD
LED1 LED2
1 2 3
4 5 6 7 8
16 CMP
15 VCC 14 VIN 13 GATE
12 CS 11 OVP 10 LED4 9 LED3
ESOP16 / DIP16
Terminal Assignment for OB3362F
Number 1
2
3 4 5
6
7 8 9 10 11 12 13 14 15 16
Pin Name ENA
DIM
GND RI
ISET
BF/DMOD
LED1 LED2 LED3 LED4 OVP
CS GATE VIN VCC CMP
I/O Pin Function
Input On/off control signal input pin
Input
DC voltage or PWM signal input pin for dimming control, the DC voltage dimming is negative polarity
Power Ground
I/O Set the switching frequency by external resistor
I/O Set the output current of every channels by external resistor
Dimming mode selection pin
I/O
• Internal bust dimming mode: connect an external capacitor to ground, and the bust frequency is set by the capacitance
• External PWM dimming mode: short this pin to ground.
I/O LED string current input
I/O LED string current input
I/O LED string current input
I/O LED string current input
Input Over voltage protection input
Input Current sense input
Output Gate drive output
Power Power supply
I/O Internal 10V LDO output
I/O Loop compensation and soft start time setting
©On-Bright Electronics
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Preliminary Datasheet OB_DOC_DS_3362F00
On-Bright Confidential to IVT
Functional Block Diagram
VIN
OB3362F
4 Channels High Performance LED Driver
VCC
ENA GND
RI CMP
BF/DMOD DIM
UVLO
LDO 10V
5V
Drive
OSC
CLK
S
+ -
- 350mV
EA +
PWM
Control
Logic
+ - 1.2V
Dimming Control
DIM
Feedback Control
1.2V
+ -
Current Control
...
GATE CS
OVP LED1 LED4
ISET Figure2: OB3362F Functional Block Diagram
©On-Bright Electronics
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Preliminary Datasheet OB_DOC_DS_3362F00
On-Bright Confidential to IVT
OB3362F
4 Channels High Performance LED Driver
Electrical Characteristics
VIN=12V, ENA=5V, ISET=60kohm to ground, TA=25℃, if not otherwise noted.
Parameter
Symbol
Condition
Min
Operating Input Voltage
VIN
6
St.