Other Parts Discussed in Thread: UCC28742
Tool/software:
Hello,
I am designing a flyback converter based on the UCC28610.
Given parameters:
- Minimum input voltage: 250V
- Maximum input voltage : 800V
- Maximum output power: 16.45W
- Operating frequency: 70kHz
- Output voltage: 17V
- Efficiency: 80%
- Dmax: 0.3
From these values, the turns ratio (n) is calculated as 6.3, and the inductance (L) is selected as 2mH.
When designing the CL resistor, substituting the values into the formula:
However, the recommended maximum value for the CL resistor appears to be 100kΩ.
Does this mean that the design is not feasible with my selected parameters?
Increasing the switching frequency to reduce MOSFET switching loss and heat generation has its limitations.