LM5576: Boost UVLO

Shuhei Goto

Expert 7370 points

Part Number: LM5576

Hi team,

[Q1]

Could you tell me the definition of Boost UVLO. Is following correct?

Boost UVLO: UVLO is activated when the BST-SW pin voltage falls below voltage of Boost UVLO.
BOOST UVLO Hysteresis: The hysteresis voltage is the voltage difference between when the UVLO is activated and when it is deactivated.

So, assuming typical values, UVLO is activated when the BST-SW pin voltage falls below 3.8V, and the UVLO is deactivated when the voltage exceeds 4.6V (3.8V + 0.8V), correct?

[Q2]

What is the maximum value of Boost UVLO?

Best regards,
Goto

8 months ago

+1 Niranjan Nair 8 months ago

TI__Mastermind 20140 points

Hi Goto,

3.8V is the Boost UVLO rising threshold and 3.8 - 0.8 is the falling threshold. So UVLO is activated when it falls below 3V and its deactivated when it goes above 3.8V.

The max. value of Boost UVLO was not spec'd as far as I know.

Regards,

Niranjan

0 Shuhei Goto 8 months ago in reply to Niranjan Nair

TI__Expert 7370 points

Hi Niranjan,

I understand that the maximum value of Boost UVLO threshold is not specified as guaranteed parameter.

That said, if possible, could you please share any comment on;

the typical range or order of magnitude of variation (e.g. 3.8V +/- XX%)
Whether temperature variation could affect this value

Best regards,
Goto

0 Niranjan Nair 8 months ago in reply to Shuhei Goto

TI__Mastermind 20140 points

Hi Goto,

Let me check if we have anything from test data and get back to you.

Regards,

Niranjan

+1 Niranjan Nair 8 months ago in reply to Niranjan Nair

TI__Mastermind 20140 points

Hi Goto,

We have char data for this but it can only be shared under NDA. Can you confirm if the customer has an active NDA with TI?

Regards,

Niranjan

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LM5576: Boost UVLO