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LM3414SD データシート(PDF) 1 Page - National Semiconductor (TI) |
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LM3414SD データシート(HTML) 1 Page - National Semiconductor (TI) |
1 / 20 page LM3414/LM3414HV August 9, 2010 1A 60W* Common Anode Capable Constant Current Buck LED Driver Requires No External Current Sensing Resistor General Description The LM3414 and LM3414HV are 1A 60W* common anode capable constant current buck LED drivers. They are excep- tionally suitable to drive single string of 3W HBLED with up to 96% efficiency. They accept input voltages from 4.5VDC to 65VDC and deliver up to 1A average LED current with ±3% accuracy. The integrated low-side N-channel power MOSFET and current sensing element realize simple and low compo- nent count circuitry as no bootstrapping capacitor and exter- nal current sensing resistor are required. An external small- signal resistor to ground provides very fine LED current adjustment, analog dimming as well as thermal fold-back functions. Constant switching frequency operation eases EMI. No ex- ternal loop compensation network is needed. The proprietary Pulse-Level-Modulation (PLM) control method benefits in high conversion efficiency and true average LED current reg- ulation. Fast response time realizes fine LED current pulse fulfilling the 240 Hz 256-step dimming resolution requirement for general lighting. The LM3414 and LM3414HV are available in ePSOP-8 and 3mm x 3mm LLP-8 packages. *Thermal de-rating applies according to actual operation con- ditions Features ■ Support LED power up to 60W*: 18x 3W HBLEDs ■ Requires NO external current sensing resistor ■ ±3% LED current accuracy ■ Up to 96% efficiency ■ High contrast ratio (Minimum dimming current pulse width <10 µS) ■ Integrated low-side N-channel MOSFET ■ Adjustable Constant LED current from 350mA to 1000mA ■ Support analog dimming and thermal fold-back ■ Wide input voltage range: 4.5V to 42V (LM3414) 4.5V to 65V (LM3414HV) ■ Constant Switching Frequency adjustable from 250 kHz to 1000 kHz ■ Thermal shutdown protection ■ Power enhanced ePSOP-8 or 3mm x 3mm LLP-8 package Appications ■ High Power LED Driver ■ Architectural Lighting, Office Troffer ■ Automotive Lighting ■ MR-16 LED Lamp Simplified Application Schematic 30124801 © 2010 National Semiconductor Corporation 301248 www.national.com |
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同様の説明 - LM3414SD |
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