UCC34141-Q1: Short-circuit protection

Shotaro Sakai

Part Number: UCC34141-Q1

Tool/software:

Hello team,

How to protect from short-circuit condition by UCC34141-Q1 function? I read the datasheet, but I could not understand...

Best regards,

Shotaro

3 months ago

0 Steven Mappus1 3 months ago

TI__Mastermind 33115 points

Refers to output voltage short circuit protection. Means it is not cycle by cycle current limit like what you expect from peak current mode control but is a latch off fault protection where the VIN or EN must be reset to clear the fault. A soft overload will cause the same latch off protection as a short circuit overload. Both are activated based on the output voltage dropping below output UVLO, as determined at the FBVDD, FBVEE pins.

Steve

0 Shotaro Sakai 3 months ago in reply to Steven Mappus1

TI__Expert 3410 points

Steve,

I understood.

Does UCC34141-Q1 have any over current protection? The configuration of the case is here.

Best regards,

Shotaro

0 Steven Mappus1 3 months ago in reply to Shotaro Sakai

TI__Mastermind 33115 points

UCC34141-Q1 does have a proprietary internal current limit function applied to the buck-boost, -VEE regulator. This is necessary to prevent the buck-boost inductor from saturating.

Steve

0 Shotaro Sakai 3 months ago in reply to Steven Mappus1

TI__Expert 3410 points

Steve,

I understand. Does datasheet have specification for the " internal current limit function"?

Best regards,

Shotaro

0 Steven Mappus1 3 months ago in reply to Shotaro Sakai

TI__Mastermind 33115 points

Not specified

0 Shotaro Sakai 3 months ago in reply to Steven Mappus1

TI__Expert 3410 points

When "internal current limit function" is latched, what is behavior of the device?

0 Steven Mappus1 3 months ago in reply to Shotaro Sakai

TI__Mastermind 33115 points

When latched fault occurs, switching stops, no output voltage and the user must toggle ENA or VIN to reset and recover from the fault.

Steve

0 Shotaro Sakai 2 months ago in reply to Steven Mappus1

TI__Expert 3410 points

Steve,

In summary, is the below correct? I want to double check my understanding before inform to customer.

Best regards,

Condition	Detection way	Operation mode	Recover way
Short-circuit	Output voltage dropping at FBVDD/FBVEE go to UVLO	Latch off	Toggle ENA or VIN
Internal current limit applied to the buck-boost-VEE regulator	Not specified on datasheet	Latch off	Toggle ENA or VIN

Shotaro

0 Steven Mappus1 2 months ago in reply to Shotaro Sakai

TI__Mastermind 33115 points

Your understanding is correct

steve

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UCC34141-Q1: Short-circuit protection