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.
| Features |
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- Support LED power up to 60 W: 18 x 3 W 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 350 mA to 1000 mA
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- Support analog dimming and thermal fold-back
- Wide input voltage range:
- 4.5 V to 42 V (LM3414)
- 4.5 V to 65 V (LM3414HV)
- Constant switching frequency adjustable from 250 kHz to 1000 kHz
- Thermal shutdown protection
- Power enhanced ePSOP-8 or 3 mm x 3 mm LLP-8 package
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| Applications |
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- High power LED driver
Architectural lighting, office troffer
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- Automotive lighting
- MR-16 LED lamp
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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.
