TINA /香料/ UCC2897A：TINA /香料/ UCC2897A：

Andy Chen36

Part Number: UCC2897A
Other Parts Discussed in Thread: TINA-TI,

Tool/software: TINA-TI or Spice Models

Hello, I'm Andy.
I try to simulate UCC2897A by TINA. (slum606)
The original voltage input value is 36 volt and the transformer turn ratio is 6:1.
I want to change Vin=65V, transformer turn ratio is 1:1, the Vout=38.
I changed the values, but it didn't work.
What should I notice??
Thanks.

over 7 years ago

0 Peter Meaney over 7 years ago

TI__Mastermind 31580 points

Hi Andy,

Can you enter your design into the calculator tool at, http://www.ti.com/product/UCC2897A/technicaldocuments

You can use the values from the calculator in the simulation.

Regards

Peter

0 Andy Chen36 over 7 years ago in reply to Peter Meaney

Intellectual 640 points

Hi Peter

I tried the calculation, but it's failed.
The Vout setting should change the parameter of the Vout feedback.
It seems like the problem is the circuit of the secondary side.
The calculation doesn't give the advice.
Thanks

0 Peter Meaney over 7 years ago in reply to Andy Chen36

TI__Mastermind 31580 points

Hi Andy,

Can you post the calculation tool and your specification and I will take a look at it.

Regards

Peter

0 Andy Chen36 over 7 years ago in reply to Peter Meaney

Intellectual 640 points

Hi Peter
The error is SR design, it's Self-excited synchronous rectification circuit.
It can simulate now, I replace SRs with diodes.
Thanks

0 Andy Chen36 over 7 years ago in reply to Andy Chen36

Intellectual 640 points

Hi Peter

I simulated the circuit, it can't be raised the Vout to 36V.
Could you help me?
Andy

slum606 Andy Test point Diode 200u.TSC

0 Peter Meaney over 7 years ago in reply to Andy Chen36

TI__Mastermind 31580 points

Hi Andy,

I tried to open the file but I cannot. Can you email the fille tome at petermeaney@ti.com

Regards

Peter

0 Andy Chen36 over 6 years ago in reply to Peter Meaney

Intellectual 640 points

Hi Peter
I found the Vout could be raised up to 36V in light load.
What can I do? duty? component value?

Regards

Andy

0 Peter Meaney over 6 years ago in reply to Andy Chen36

TI__Mastermind 31580 points

Hi Andy,

If the output voltage rises above the setpoint or normal regulation value then the feedback circuit should pull the FB pin low to reduce the duty cycle from the controller.

Please check that your feedback circuit is working correctly and that the voltage on the FB is been pulled towards 0V at light load.

Regards

Peter

0 Peter Meaney over 6 years ago in reply to Peter Meaney

TI__Mastermind 31580 points

Hi Andy,

I am closing this post since we are communicating through email now.

Regards

Peter

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TINA /香料/ UCC2897A：TINA /香料/ UCC2897A：