2019.08.07
Points of this article
・The design procedure, in broad outline, is as follows.
1. Design of the synchronous rectifying circuit part:
Selection of MOSFETs for synchronous rectification, Controller IC selection, Selection of peripheral components
2. Design of the shunt regulator circuit part
3. Troubleshooting
4. Characteristic evaluation
In ” Design of a Secondary-Side Synchronous Rectifying Circuit to Improve the Efficiency of an AC-DC Converter”, an example of the synchronous rectification design of an AC-DC converter with diode rectification using the BM1R001xxF series of secondary-side synchronous rectifying controller ICs will be explained. We begin by describing the design procedure.
An example of synchronous rectification design of an AC-DC converter with diode rectification using a BM1R001xxF series secondary-side synchronous rectifying controller IC is presented.
The essence of this design is replacement of the rectifying diodes and shunt regulator on the secondary side of the AC-DC converter with the BM1R001xxF series secondary-side synchronous rectifying controller IC, to improve the efficiency of the AC-DC converter. The design process generally follows the procedure outlined below.
The circuit designs in 1 and 2 are summarized. Primary-side design is not included in this design example.
1. Summary of design of the synchronous rectification circuit part
1-1. Selection of MOSFETs for synchronous rectification
1-2. Controller IC selection
1-3. Selection of peripheral components
2. Summary of design of the shunt regulator circuit part
The next article will describe the design example and explain the BM1R001xxF series product used in the design.