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| Spec | 3 series LEDs | 4 series LEDs | 5 series LEDs |
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| Input Voltage, VIN | 12 VAC | 12 VAC | 12 VAC |
| Output Voltage, VOUT | 10.6V | 13.5V | 16.7V |
| Input Current, IIN | 600 mA | 640 mA | 660 mA |
| LED Output Current, ILED | 485 mA | 415 mA | 350 mA |
| Input Power, PIN | ~6.6W | ~7.1W | ~7.4W |
| Output Power, POUT | ~5.2W | ~5.6W | ~5.9W |
| Efficiency | ~78% | ~79% | ~80% |
| Power Factor | 0.92 | 0.93 | 0.93 |
| SMPS Topology | Buck Boost | Buck Boost | Buck Boost |
NOTE: These specifications are typical values based on the LED driver being powered directly by a 12VAC
supply (i.e. no electronic or magnetic step-down transformer).
Design Description
This reference design was based on the released LM3444 IC from National Semiconductor.
This design was developed to minimize the current spikes coming out of an electronic transformer
to less than 5A, which is a typical transformer rating, when driving an LED MR16 circuit. The off the shelf
LED MR16 solutions exhibit spikes that significantly exceed a transformer's maximum rated output current which
will degrade the reliability of the transformer and reduce its operating lifetime.
The circuit operates in a constant output power mode. The output power is fixed at about 5.5W.
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Design Resources
Additional Product Resources
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LM3444
- High Efficiency Small Footprint LED controller |
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- datasheet
- application notes
- Webench® Online design tools
- samples
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Features
- Tested with Electronic Transformers (12VAC output)
- Work with off the shelf dimmers with no flicker, stable operation
- Flicker-free operation with common Electronic Low Voltage dimmers, and Electronic Transformers
LM3444 MR16 Reference Design for Non-Dimming & Dimming LED Applications
LM3444 MR16 Reference Design for Non-Dimming & Dimming LED Applications
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