GENERAL DESCRIPTION

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.

FEATURES

Current Mode PWM Controller With Good Dynamic Response

9V to 30V Input Voltage Range

External PWM Dimming Mode

Over Voltage Protection

Over Current Protection

LED open protection

LED short protection

LED cathode short to GND Protection

Diode & Inductor Short Protection

Under Voltage Lockout (UVLO)

Thermal Shutdown

Flicker free Dimming Range from 0% to 100%

APPLICATIONS

LCD Monitor

LCD TV

Flat panel display

TYPICAL APPLICATION