STMicroelectronics AN2131 High Power 3-Phase Auxiliary Power Supply Design Application Note

About this manual

The document describes the design of a flyback stage operating in mixed mode (discontinuous and continuous) to handle high DC input voltages typical of three-phase applications. It utilizes the L5991 PWM driver, an upgraded version of the UC384X series, which features a stand-by function for low power consumption modes.

What's inside

• Introduction
• Design Specifications and Preliminary Remarks
• Flyback Continuous Mode with L5991
• Flyback Stage Design

Frequently asked questions

What is the maximum output power of the converter described in this application note?

The converter is designed for a maximum output power of 150W.

What are the switching frequencies used for normal and stand-by modes?

The system operates at 90 kHz for normal mode and 35 KHz for stand-by mode.

What is the maximum over-voltage limited by the clamping circuit?

The clamping circuit limits the maximum over-voltage to 200V.