Designing the output rectifier/filter stage
Selection of the output rectifier
Let us select the MBR360 for D4.
Calculating the needed output filter capacitor
make C8 equal 47mF at 25VDC. I will use a very good grade tantalum capaci-
tor and place in parallel a 0.5mF ceramic capacitor.
Designing the bootstrap start-up section
I will be using the current limited linear regulator type of start-up circuit.
For R1, the base bias resistor,
For R2, the collector current limiting resistor,
Design of the controller section
I will be using a garden variety UC3842 current-mode control IC. The IC selec-
tion is important because it cannot have 50 percent duty cycle limiting. ...