GENERAL DESCRIPTION

The OB3365 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 optimized to drive multi LED arrays; and thus provides a high performance LED backlight solution with minimized BOM count.

The OB3365 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 OB3365 integrates 4 channels current balancer with up to 350mA current capability per channel and it achieves 1.5% matching accuracy among LED strings. It also supports 400mA pulse current for application. The minimum voltage of current source is regulated according to the current capability to benefit the efficiency and to improve the IC thermal performance.

The OB3365 supports direct PWM dimming and PWM to analog dimming which allows flexible control of the backlight luminance. The LED current is directly modulated by PWM duty cycle on PWM pin.

The OB3365 can be connected in a parallel application with several ICs sharing the same power train circuit to provide a flexible and effective solution for systems where more than 4 arrays LED are used.

OB3365 is offered in 16-pin SOP/DIP/ ESOP/TSSOP16

FEATURES

12V gate drive, better MOS compatibility

High efficiency and compact size

9V to 30V input voltage range

1.5% matching accuracy between 4 LED strings control currents

100KHz~300KHz operating frequency

Direct PWM dimming and PWM to analog dimming

Programmable over voltage protection

Under voltage lockout(UVLO)

LED string open/short protection

LED cathode node to ground short protection

Inductor/diode short protection

Over temperature protection (OTP)

Thermal foldback function for LED output current control

Support multiple ICs parallel operation

APPLICATIONS

LCD Monitor

LCD TV

Flat panel display

TYPICAL APPLICATION