AN2300 is an application note published by STMicroelectronics, which introduces a switch power supply design scheme based on the VIPer12A chip. The scheme uses a capacitor to store energy, which can achieve low-cost and high-efficiency switch power supply design.
The document introduces three different two-output power supply solutions: a capacitive passive network and two versions of low-cost SMPS Buck converters. The latter are based on the VIPer12A, a high-voltage Power MOSFET with an integrated current mode PWM controller by STMicroelectronics.
The note compares these converters in terms of output voltage regulation, efficiency, and EMI under approximately 0.6W output power conditions. It also details modifications to extend the output power level up to 1.1W.
| AC input voltage | 185+265Vac |
|---|---|
| Output 1 voltage | 12V |
| Output 1 current | 30mA |
| Output 2 voltage | 5V |
| Output 2 current | 40mA |
| Total output power | 0.6W |
To introduce an alternative solution to capacitive power supplies using a Buck converter based on VIPer12A.
The document presents modifications to extend the output power level up to 1.1W.