PWM High-Efficiency LED driver

详情

The BCT***5 is a PWM High-Efficiency LED driver with a built in internal power MOSFET, capable of driving up to 1.5A continuous output current with excellent constant current regulation. It allows efficient operation of High Power, High Brightness LEDs from voltage sources ranging from 4.5V to *5V. The LED string is driven at constant current, thus BCT***5 provides constant light output and enhanced reliability. The output can be programmed by an external resistor, DC, or PWM signal. Requiring only a minimum number of external components, it offers simple to use, but high efficiency and advanced protection features including current limiting and thermal shutdown. Adjustable LED current and dimming control will give flexible light levels in the system operation and the regulator draws minimum current in shutdown mode. BCT***5 is available in a Pb-Free SOIC8 with Exposed Pad package. FEATURES • High Efficiency up to *5% • Wide Vin Range: 4.5 to *5V • Only 5 External Components • Very Low Reference Voltage **0mV • 1.5A Maximum Output Current • Suitable for 3W/5W HBLED strings • Adjustable LED current by an external RSET • DC or PWM Dimming Control via a DIM Pin • 1MHz Fixed Frequency internal oscillator • Integrated Soft-Start & Compensation • Integrated Thermal Shutdown • Compact SOIC8 with Exposed Pad APPLICATIONS • High Power LED Driver • DC/DC or AC/DC LED Applications • Indoor/Outdoor Sign Board • Decorative LED Lighting • General Purpose constant current source • Automotive