6335.pdf | | AN1094 Application note
Solution for off-line SMPS using VIPer100-E
Introduction
The present board prototype is a wide-range input off-line 50 W single switch Flyback, working at 100 kHz. It is based on a new off-line smart switcher: the VIPer100-E. The VIPer100-E is a current mode PWM with a 620 V / 2.5 power switch, able to withstand an avalanche current during normal operation. The start-up of the circuit is done with an internal high voltage current source, which is switched off during steady state. It also includes a regulation function designed to minimize the pin count, while maintaining design flexibility. Figure 2 presents the internal block diagram of this monolithic device. Such a device can be easily used in any off-line flyback SMPS, with a 100 W power capability for a single input voltage range, or 50 W with a wide input range. This stand-alone off-line Smart Switcher concept provides a cost effective solution for SMPS for many applications such as VCRs, TV sets, satelli |