This is a low power high voltage power supply reference design, which supports 1 to 3 phase input, the input voltage range is between 90 and 450VAC, and the output voltage is 5V and 3.3V. The output power is 550mW
This document describes the STEVAL-ISA012V1, a reference design representing a cost-effective solution for low-power high-voltage power supplies. It is developed to cover applications requiring an ultra-wide input voltage range between 90 and 450 Vac, typical of three-phase scenarios.
The circuit utilizes a switching transistor connected between the input rectifier and the DC bulk capacitor, leveraging a STMicroelectronics patent. This design allows the SMPS primary transistor to be selected as either a standard part or a smart power primary IC.
| Minimum AC input voltage | 90 Vac |
|---|---|
| Maximum AC input voltage | 450 Vac |
| Time of hold up capability | > 50 ms |
| Mean input power | < 6 W |
| Output voltage Vouti | 5 V |
| Output current Iout | 10 mA |
| Output voltage Voute | 3.3 V |
| Maximum ripple voltage | 50 mV |
The device supports a minimum AC input voltage of 90 Vac.
The supply provides a maximum output current of 100 mA at 3.3 V.
This design covers applications requiring an ultra-wide input voltage range between 90 and 450 Vac.