why the TL494 PWM can't work

Temption up to PEak

Prodigy 70 points

The circuit as follows,but I can't detect the PWM wave.

I don't know why.I run it in Multism and it's correct.

who can settle this problem and give me an explanation.

Thanks.

over 8 years ago

0 Britt Brooks - Online Design Tools over 8 years ago

TI__Mastermind 41310 points

Temption,

I have moved your post to the Isolated DC/DC forum. Since your simulation is working, perhaps they can give you some insight into why the actual circuit is not working for you.

0 Michael J Schultis over 8 years ago in reply to Britt Brooks - Online Design Tools

TI__Mastermind 24805 points

Hello,

Are you saying that the circuit works perfectly in multisim, but it does not work on a pcb?
Can you share a clearer schematic? Do you have an example layout or image of your board?
What are you trying to achieve with this circuit? Please provide additional details on inputs and expected and measured outputs.

Best,
Michael

Because of the Thanksgiving holiday in the U.S., TI E2E™ design support forum responses may be delayed from November 25 through December 2. Thank you for your patience.

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why the TL494 PWM can't work

The circuit as follows,but I can't detect the PWM wave.