ViPer12A ViPer22A İzolasyonsuz smps güç kaynağı tasarımı

“VIPer12A VIPer22A non-isolated power supply desing” ST Microelectronics firmasının VIper serisinden viper12 viper22 entegreleri için hazırladığı izolasyonsuz smps güç kaynağı tasarım programı özellikle beyaz led, power led çalıştırmak için çeşitli devreler tasarlanabilir ya da fazla akım çekmeyen her hangi bir devrenin beslemesinde kullanılabilir nüveli trafo yerine bobin kullanıldığı için yapımı biraz daha kolay olacaktır.

0…500ma arası güç veren (12v üzerinde çıkışa göre bu değer değişir) devreler hazırlanabiliyor

Output voltage selection – step 1

Operations In the output voltage window the user must set:
● output voltage
● output current
● output voltage ripple.

The results are the needed capacitance value and equivalent series resistance (ESR) of the output capacitor.

VIPer selection – step 2

1. Device selection: the software automatically selects the device based on the output
power.

2. Operating mode: discontinuous mode is set by default but the user can change it to
continuous.

3. Maximum ambient temperature: has an impact on power dissipation, thus on the
converter’s power capability.

4. Case-ambient thermal resistance: the default value can be decreased and power
dissipation improved by providing a heat sink.

AC/DC input – step 3

1. Input voltage range selection:
– 110 V range
– 230 V range
– Full range

2. Input ripple selection

3. Hold-up cycles selection

4. Line frequency selection: 50 or 60 Hz

Output inductance selection – step 4

In the inductor setting window, the user can change the default inductor by either choosing another inductor in a given database, or directly entering the inductance value, ESR, ISAT and parasitic capacitance of the custom inductor. The inductor is used for energy storage, and its selection depends on the output power and on the power switch.

A custom ferrite inductor must be used in case of high output power converters. For low
output power converters an axial insulated inductor can be used. The drawback of this low
cost solution is the higher series resistance that could affect the efficiency of the converter. The inductance value determines whether the circuit operates in discontinuous mode or in continuous mode for a given output current.

Ayrıca “documention” bölümüde kullanılan entegrelerin datasheet bilgileri ve ilgili uygulama notları bulunuyor.