Reference design enables a secondary side MCU to control primary power: Page 2 of 3

January 06, 2021 //By Jean-Pierre Joosting
Reference design enables a secondary side MCU to control primary power
AC-DC controller plus Inde-Flux™ transformer technology simplifies design, reducing size and cost with up to 60% savings of the bias supply area.

The MPC1012 primary-side auxiliary controller provides for system start up, gating and protecting an offline flyback converter for the secondary MCU. The device enables a range of benefits such as direct measurement and active regulation of voltage and/or current, high loop bandwidth by direct loop closure and simplified communication for load-referenced systems.

The 15-W MCP1012 offline reference design provides the principal working elements for a 15-W offline power design with the necessary firmware to enable the elimination of the auxiliary power supply on the primary side. This can reduce the complexity of the system including eliminating the need for optocouplers in many applications such as appliances and smart speakers. This Inde-Flux transformer technology, in cooperation with Würth Elektronik eiSos, can be scaled to standard and custom transformer designs for different voltages and power levels as needed.

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