3.3V, 40V DC to DC Multi-Output Power Supply

As discussed in application note, AN728, the Si9113 power supply controller is an ideal choice for ISDN terminal equipment, where high efficiency at a low power level is one of most important criteria. Therefore, Vishay Siliconix has developed versions of a dual output flyback application. The Si9113D1 senses and tightly regulates the main output VOUT1 (3.3 V), which has the common ground as input and the secondary output VOUT2 (40 V) is regulated to within 10% at