UCC25600: circuit of CT for the Overcurrent protection pin

R.Fukunaga

Expert 2505 points

Part Number: UCC25600
Other Parts Discussed in Thread: UCC25660

Tool/software:

Hi all,

i'd like to be checked the circuit.

I was asking the question in the thread below.

(+) UCC25660: ISNS has an indefinite value when turned on - Power management forum - Power management - TI E2E support forums

My customer is considering using UCC25600 instead of UCC25660.

They are considering a current detection circuit using CT for the Overcurrent protection pin of UCC25600 as a full bridge LLC controller. (Red frame)

I would appreciate if you could give me some advice.

Best Regards,

Ryusuke

5 months ago

0 Manikanta Pallantla 5 months ago

TI__Genius 16155 points

Hi Ryusuke,

The easiest way is for you to simulate the circuit in open loop (at lower input voltage and at max load condition) using any simulation software and put the CT in the circuit and see the magnitude of the CS pin voltage. That way you can decide the CT turns ratio.

Regards

Manikanta P

0 R.Fukunaga 5 months ago in reply to Manikanta Pallantla

Expert 2505 points

Hi Manikanta,

In the thread below, I have corrected it after being pointed out, so I would like you to check with the manufacturer.

(+) UCC25660: ISNS has an indefinite value when turned on - Power management forum - Power management - TI E2E support forums

I have corrected the circuit and will send it to you. I would like you to check it.

I can communicate via private message. In that case, should I send you a private message? or is there someone else in charge?

Sorry for the inconvenience,but I would appreciate any advice.

Best Regards,

Ryusuke

0 Manikanta Pallantla 5 months ago in reply to R.Fukunaga

TI__Genius 16155 points

Hi Ryusuke,

My previous suggestion is still valid for your current sensing circuit.

Regards

Manikanta P

0 R.Fukunaga 5 months ago in reply to Manikanta Pallantla

Expert 2505 points

Hi Manikanta,

About Current Detection Circuit, I have proposed to the customer to run a simulation.

About the rest of the circuit, Is there anything to worry about?

Best Regards,

Ryusuke

0 Manikanta Pallantla 5 months ago in reply to R.Fukunaga

TI__Genius 16155 points

Hi Ryusuke,

To verify the functionality of your proposed circuit, you will have to run the simulation.

You can find the TINA simulation files here:

UCC25600 data sheet, product information and support | TI.com

Regards

Manikanta P