If Vin - Vout = 400V then you have 80ma * 400V = 32 watts This will take quite a heatsink! Bob Ammerman RAm Systems ----- Original Message ----- From: "Jan-Erik Soderholm XA (TN/PAC)" To: Sent: Tuesday, September 16, 2003 3:44 PM Subject: [EE]: Mains connected linear voltage reg. > Hi. > Just come across some linear voltage regulators > from ST Microelectronics called VB408 and VB409. > They have a high input voltage range (400 and 580V), > so they can be connected directly to rectified 110 > or 220 V mains. They deliver a max of 40 or 80mA, so > could easily feed a simple PIC circuit. > > http://us.st.com/stonline/books/pdf/docs/6421.pdf > http://us.st.com/stonline/books/pdf/docs/6941.pdf > > The VB408 is $0.84 is single quantity at Mouser. > > (23.90 SEK from Farnell in Sweden, or aprox $2.90 !) > > > Now, anyone looked at these ? Or any similar mains > connected volt regulator ? Could be an alternative > to the usual "cap-voltage-divider" used in low power > mains connected microcontroller circuits maybe ? > > Jan-Erik. > > -- > http://www.piclist.com hint: The PICList is archived three different > ways. See http://www.piclist.com/#archives for details. > -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.