UCC23511-Q1: Short-Circuit Clamping

Tobias Kolip

Part Number: UCC23511-Q1

Hello all,

I want to add an additional diode for the short-circuit fuse. However, it is not clear to me where exactly the diode should be installed. What is the dedicated pin?

Thank you a lot.
Tobias

over 2 years ago

0 Don Dapkus over 2 years ago

TI__Guru**** 189399 points

Hi, Tobias,

I'm sorry, I don't quite understand your question. Can you elaborate a little? Maybe give me an example of what you are trying to accomplish?

Best regards,

Don

0 Tobias Kolip over 2 years ago in reply to Don Dapkus

Prodigy 10 points

Hy,

Oh sorry, I didn't mean fuse I meant short-circuit protection.

I mean the diode in this paragraph. Where is the additional diode mounted? Between which PIN exactly?

Do you know what I mean?

Tobias

+1 Don Dapkus over 2 years ago in reply to Tobias Kolip

TI__Guru**** 189399 points

Hi, Tobias,

Thanks for the clarification! Now I understand.

Tie your diode from pin 5 to 6 (VOUT to VCC). Tie the cathode to VCC.

Best regards,

Don

0 Tobias Kolip over 2 years ago in reply to Don Dapkus

Prodigy 10 points

Hey Don,

that was what I was looking for. Thanks for your help.

0 Tobias Kolip over 2 years ago in reply to Don Dapkus

Prodigy 10 points

Hey, Don,
I do still have a question.
I have now built the circuit with the diode. Now I have made a short circuit from pin 5 (Vout) to pin 4 (VEE/GND). However, the component was destroyed. Can you tell me exactly what the diode is for? What exactly is the diode supposed to protect?

Thanks
Tobias

0 Don Dapkus over 2 years ago in reply to Tobias Kolip

TI__Guru**** 189399 points

Hi, Tobias,

That's why we are here! Happy to help.

Unfortunately, the text is a little confusing. Our drivers do not have output short circuit protection of the VOUT terminal. If you short that to VCC or VEE, and then drive it low or high, the output will become permanently damaged.

The reason we talk about the diode and short-circuiting is if the output switch gets short-circuited. This can cause a large positive voltage transient on the gate, so we suggest in certain applications you apply an external diode to shunt that voltage to VCC.

I hope this is clear. Let me know if you have further questions, Tobias!

Best regards,

Don

0 Don Dapkus over 2 years ago in reply to Don Dapkus

TI__Guru**** 189399 points

Hi, Tobias,

Are you using our gate driver to drive a power switch (IGBT, MOSFET, SiCFET, etc), or some other kind of load? Our gate drivers are designed to drive the gates of power switches.

Best regards,

Don

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UCC23511-Q1: Short-Circuit Clamping