Hi Randy,
For this design, the input capacitors will obviously need to be rated for 450V. If you have a fixed output voltage, the two-winding primary bias structure is not needed. The voltage stress on the FETs (Q1, Q2 and Q7 will need to be checked…
Hi Navi,
1. I suggest following the UCC28740EVM schematic if you want to use 7508111111, because it already uses that transformer and has been tested and documented with it.
2. These designs have not been tested or designed for a DC input voltage…
Hi Navi,
This design should work fine with 90VDC input. Below that operation is not guaranteed without redesign. 25VDC is way too low. We do not have the internal transformer construction details with exact number of turns per winding, but the primary…
Hi Navi,
This is referred to as Primary Side Regulation (PSR). It reduces cost and complexity, but regulation is a little bit worse than using an optocoupler. Here is a short article on this topic .
thanks, Brian
Hi Navi,
Sorry for the delayed response. Please see my answers to your questions below:
1. While not designed for 75VAC to 275VAC, this design will still operate across that range.
2. The output voltage can be adjusted by changing the value of R16…
Hi Navi,
Sorry for the delayed response. Please see my answers to your questions below:
1. While not designed for 75VAC to 275VAC, this design will still operate across that range.
2. The output voltage can be adjusted by changing the value of R9…
Hi Navi,
Sorry for my delayed response. I am not an expert at using TINA. I am trying to find an appropriate person at TI to help respond to your question here.
thanks, Brian
Hi Navi,
Sorry for the delayed response. Please see my answers to your questions below:
1. While not designed for 75VAC to 275VAC, this design will still operate across that range.
2. The output voltage can be adjusted by changing the value of R16…
