LM25139-Q1: Vout worst case analysis

Wenwen jiang

Part Number: LM25139-Q1

Tool/software:

Hi E2E teacher,

How to do LM25139QRGTRQ1 Vout worst case analysis? And any other worst case analysis to be recommended?

What factors should to be considered in calculate? such as Error OA Voffset, Ioffset? but they can't be found in datasheet?

As below Vfb/Ifb considered Vin/Iout and other factors?

2 days ago

0 Dino Maslic 2 days ago

TI__Expert 4920 points

Hi Wenwen,

What are you referring to by "worst case" in relation to VOUT? Are you saying what could be the worst case for how far VOUT could be regulating at from your "nominal" value?

If this is the case, the primary factors adding to this would be the accuracy of your feedback resistors and the FB reference voltage accuracy.

Thanks,

Dino

0 Wenwen jiang 1 day ago in reply to Dino Maslic

Prodigy 20 points

Hi Dino,

Yes. Should I consider load or line regulation, if it works in 6~18V?

0 Dino Maslic 1 day ago in reply to Wenwen jiang

TI__Expert 4920 points

Wenwen,

The device will have a tight regulation across VIN and load assuming the VIN is high enough to not be in dropout. Doesn't need to be in the calculation.

-Dino

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LM25139-Q1: Vout worst case analysis