LM3414/LM3414HV Buck LED Driver

Texas Instruments' LM3414 and LM3414HV are 1 A 60 W* common anode capable constant current buck LED drivers. They are exceptionally suitable to drive single string of 3 W HBLED with up to 96% efficiency. They accept input voltages from 4.5 VDC to 65 VDC and deliver up to 1 A average LED current with ±3% accuracy. The integrated low-side N-channel power MOSFET and current sensing element realizes simple and low component count circuitry, as no bootstrapping capacitors and external current sensing resistors 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 external loop compensation network is needed.