OB3370N

OB3370N Cost Effective LED Controller GENERAL DESCRIPTION OB3370N is a high integrated and cost effective Light Emitting Diode (LED) driver optimized for LCD monitor and LCD TV backlight application. The OB3370N operates in voltage mode boost topology with fixed frequency 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 200mV, the error is amplified to control the pulse width of the power switch thus to regulate the current flowing the LED. It offers both internal burst and external low frequency PWM (LPWM) dimming methods for a wide range of dimming control. OB3370N integrates under voltage lockout (VCC UVLO) and output over voltage protections that prevent the damage in the event of abnormal conditions. The output voltage level is monitored through OVP pin and it turns off the converter if an over voltage condition is present due to an open circuit condition. The OB3370N is available in SOP-8 Packages. Product Specification FEATURES „ Voltage Mode PWM Controller „ Flexible Dimming Mode Control: | Internal burst dimming control | External burst (LPWM) dimming control „ 0-2V DC voltage direct dimming control without external circuits „ Output Over Voltage Protections „ Under Voltage Lockout „ Soft Start APPLICATIONS „ LCD Monitor „ LCD TV „ Flat panel display TYPICAL APPLICATION Figure1. OB3370N Typical Application Schematic ©On-Bright Electronics...