STEVAL-ISA035V1: 4.2W, 12V @ 350mA, 85 ~ 265 Vin

Many appliances today use non-isolated power supply to furnish low output power required to run a micro, LED display, and a few relays or AC switches. This type of power supply has a single rectifier so as to reference the neutral to output ground in order to fire TRIACs or AC switches.

This article describes the use of the VIPer12A-E and the VIPer22A-E which are pin-for-pin compatible and can supply power for many applications. This paper provides an off-line, non-isolated power supply evaluation board based on the VIPer12/22A-E. Four different examples are covered. The VIPer12A-E is used for 12 V at 200 mA and 16 V at 200 mA. The VIPer22A-E is used for 12 V at 350 mA and 16 V at 350 mA. This board comes set to 12 V at 350 mA.

The same board can be used for any output voltage from 10 V to 35 V. For outputs less than 16 V, D6 and C4 are populated and W1 is omitted. For outputs greater than 16 V, D6 and C4 are omitted and W1 is populated. For more design detail, see AN1357 "VIPower: low cost power sullies using the VIPer12A-E in non-isolated application." The objective of this application note is to familiarize the end user with this reference design and to quickly modify it for different voltage output.