SMPS design using UCC28700, Not getting the proper output.

Thread Starter

ashokraj

Joined Feb 1, 2018
109
Hi,
I have designed a circuit based on web bench power supply design from texas instrument in TINA. web bench power supply
I could not able to get the appropriate voltage(24V) at the output of secondary coil. I suspect the problem is in transformer. Is there a way I can custom design a transformer in TINA?

If transformer is not the problem I am open for corrections.

I have attached my TINA design file below.

Please provide some insights.
 

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Dodgydave

Joined Jun 22, 2012
9,956
The two resistors R12, R13 set the output voltage, the Vs pin requires 4V to set the output, your values are approx 20V increase R12. Also the three 4M start up resistors are too high, just use one 4M.
 

Ian0

Joined Aug 7, 2020
2,289
Three resistors are in series because a single one doesn't have enough voltage rating if it's a 1206 or smaller - but they won't flash over in a simulation!
 
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