AN2528 is an application note about a 6W SMPS, it is suitable for metering and other applications. The note introduces the design idea and circuit structure of the power supply, and gives detailed design details and test results.
The document presents the complete design methodology for a 6 W single output SMPS suitable for metering applications, featuring a very wide input voltage range. The design is based on the L6565 QR PWM driver and the STCO4IE170HP small signal power switch.
Key topics covered include flyback stage calculations, handling parasitic capacitances to minimize power dissipation, base drive circuit design for ESBT switches, and experimental results showing waveforms and efficiency. The note also references a specific demo board (STEVAL-ISAQ30V1) associated with this design.
The design supports a maximum output power of 6 W.
The converter operates with a rectified minimum input voltage of 150 V and a maximum of 850 V.
The design specifies a minimum switching frequency of 30 kHz.