OB3350E 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 OB3350E 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 OB3350E offers external low frequency PWM (LPWM) dimming method for a wide range of dimming control.

The OB3350E offers comprehensive protection such as LED open protection and LED short protection, power MOSFET over current protection (OCP), output over voltage protection (OVP), the cathode of LED short to GND protection, Diode & Inductor short protection, IC power supply under voltage lockout (UVLO), Over thermal protection(OTP).

The OB3350E is offered in SOP-8 Packages.


n Current Mode PWM Controller With Good Dynamic Response

n 9V to 30V Input Voltage Range

n External PWM Dimming Mode

n Over Voltage Protection

n Over Current Protection

n LED open protection

n LED short protection

n LED cathode short to GND Protection

n Diode & Inductor Short Protection

n Under Voltage Lockout (UVLO)

n Thermal Shutdown

n Flicker free Dimming Range from 0% to 100%




n LCD Monitor


n Flat panel display