OB3350

GENERAL DESCRIPTION

OB3350 is a highly integrated and cost effective Light Emitting Diode (LED) driver optimized for LCD monitor and LCD TV backlighting application. It provides a high performance LED backlight solution with minimized BOM count.

The OB3350 contains a PWM boost driver which uses current mode control and fixed frequency operation to regulate the LED current. The LED current is sensed through an external current sense resistor. The voltage across the sensing resistor is compared with reference level of 300mV, the error is amplified to control the pulse width of the power switch thus to regulate the current flowing the LED.  

The OB3350 offers external low frequency PWM (LPWM) dimming method for a wide range of dimming control.

The OB3350 offers comprehensive protection such as power MOSFET over current protection (OCP), output over voltage protection (OVP), Diode & Inductor short protection, LED cathode short to GND protection, IC power supply under voltage lockout (UVLO), and LED open protection.

The OB3350 is offered in SOP-8 Packages.

FEATURES

n Current Mode PWM Controller With Good Dynamic Response

n 9V to 35V Input Voltage Range

n External PWM Dimming Mode

n Over Voltage Protection

n Over Current Protection

n Under Voltage Lockout (UVLO)

n Thermal Shutdown

n Diode & Inductor Short Protection

n LED cathode short to GND Protection

 

APPLICATIONS

n LCD Monitor

n LCD TV

n Flat panel display

 

TYPICALICAL APPLICATION