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| Features and Description |
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Minimum AC input voltage = 90 VAC |
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Maximum AC input voltage = 450 VAC |
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Time of hold up capability > 50 mS |
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Mean input power < 6 W (in compliance with IEC62053-21) |
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Input connections allowed: 1-phase with neutral, 3-phase with neutral, 2-phase without neutral |
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VOUT1 = 5 V, IOUT1 = 10 mA |
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VOUT2 = 3.3 V, IOUT2 = 100 mA |
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Maximum precision error = 3% |
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Maximum ripple voltage = 50 mV |
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Line regulation = +/- 1% |
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Load regulation = +/- 1% |
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Output power (peak) = 550 mW |
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 This reference design represents a cost effective solution for low power high voltage power supplies.
It has been developed to cover applications requiring an ultra-wide input voltage range (between 90 and 450 Vac), typical of three-phase applications. This requires the use of very high voltage components, which increases cost, size, weight and the overall complexity of the power supply.
The circuit includes a switching transistor connected between the input rectifier and the DC bulk capacitor (STMicroelectronics patent). The series switch limits the DC input voltage of the power converter by means of a driving circuit; thus the SMPS primary transistor can be selected as a standard part as well as a smart power primary IC.
Typical end applications for this solution can be found in the industrial market in the range below 5 W, such as three-phase and single-phase power meters, industrial bias power supplies and auxiliary SMPS for high voltage street lighting, where the input voltage can range from 90 Vac to 450 Vac and 1000 V power MOSFETs are currently used. |
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| Technical Documentation |
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| Resources |
| Gerber Files |
Download (31-October-2007, 36 KB) |
| Schematics |
Download (31-October-2007, 33 KB) |
| Bill of material |
Download (31-October-2007, 64 KB) |
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| Key Products |
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| Purchase |
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