NCL30105

NCL30105 Constant Off Time PWM Current-Mode Controller for LED Applications The NCL30105 is a peak current controlled fixed off time controller designed for LED driver applications in which the LEDs are operated in deep Continuous Conduction Mode (CCM) without requiring slope compensation. Featuring an adjustable off time generator, the controller can drive a MOSFET up to a 500 kHz switching frequency. A dedicated dimming pin enables the use of a pulse−width modulated logic signal to dim the LEDs directly. The soft−start pin creates a startup sequence that slowly ramps up the peak current and enables the adjustment of the peak current setpoint for analog dimming control. The device features robust protection features to detect switch overcurrent faults and to detect maximum on time events. Features Constant Off Time Current−Mode Control Operation Adjustable Off Time (0.5 ms to 10 ms) Internal Leading Edge Blanking Source 250 mA / Sink 500 mA Peak Drive Capability ±3.2% Current Sense Accuracy at 25°C Internal Startup Delay 3.3 V Logic Level Dimming Input This is a Pb−Free Device Safety Features Thermal Shutdown Maximum On Time Protection Overcurrent Protection Typical Application LED Backlight Drivers for LCD Panels LED Light Bars LED Street Lighting LED Bulbs http://onsemi.com 8 1 SOIC−8 D SUFFIX CASE 751 MARKING DIAGRAM 8 L0105 ALYW G 1 L0105 A L Y W G = Specific Device Code = Assembly Location = Wafer Lot = Year = Work Week = Pb−Free Pac...