gevv
| | Tarih: 13.12.2006, 13:20 Mesaj konusu: 12v 4a smps | |
| 1 Introduction
The present board prototype is a wide-range input off-line 50W single switch Flyback, working at 100 kHz.
It is based on a new off-line smart switcher : the VIPer100.
Figure 1: Standard Demoboard - ORDER CODE: VIPERKITBD
The VIPer100 is a current mode PWM with a 620V / 2.5W 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 of many applications like VCR, TV
sets, satellite receivers or decoders. The benefits for the customer are a simpler design phase and a
reduced overall components count due to the optimization of the product configuration.
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