Viper22A PWM Kontrol İle Ultra Parlak Beyaz Led Sürücüler

Viper22A bir kaç yıldır oldukca popüler bende kullandım teorik olarak fazla detay veremem fakat toleransı yüksek diyebilirim çok değişik denemelerimde patlamadan, çatlamadan çalıştı ya da korumaya geçti fiyatıda uygun gayet düzgün çalışıyor. Entegrenin sabit 60khz çalışma frekansı var 20w güç verebiliyor besleme voltajı 9v…38v arası ayrıca daha önce paylaştığım tasarım programlarıda bulunuyor (“ViPer12A ViPer22A İzolasyonsuz smps güç kaynağı tasarımı“, “STMicroelectronics VIPer Smps Tasarım Programı ” )

İki adet led sürücü uygulaması var uygulamalar üretici (STMicroelectronics) firma tarafından gerçekleştirilmiş en inçe detayına kadar tüm bilgiler, pcb şema çizimleri verilmiş

Viper12 VIPer22A Offline constant current LED driver

High brightness LEDs are becoming a prominent source of light and often have better efficiency and reliability when compared to that of conventional light sources. While LEDs can operate from an energy source as simple as a battery and resistor, most applications require an efficient energy source not only for the reduction of losses, but also for the lumen maintenance of the LED itself. Using integrated off line switching regulators like the VIPer12A and VIPer22A in a constant current configuration, a low cost, high efficient LED driver for multiple LEDs has been developed.

Viper22A-E Dimmable driver for high brightness LEDs

This application note introduces an innovative solution to drive high brightness 1W LEDs VIPer22A-E in flyback configuration with output current control. The power supply is able to drive an array of 1 to 8 LEDs in European range, i.e. 185-265 VAC with no modifications. By means of an input voltage doubler, it is possible to use the same VIPer device also in U.S. input voltage range, guaranteeing the specs. A new control technique is used to adjust the duty cycle of the output current, in order to dim the luminosity of the LEDs down to 10% of the maximum value (patent pending by STMicroelectronics).