TLV755P: Gain margin and phase margin

Patrick Chen(TPE System & Application)

Expert 3430 points

Part Number: TLV755P

Hi Sir,

My customer is asking if we could provide the Gain margin and phase margin test result with TLV75510?

Many thanks,

Patrick

over 7 years ago

0 Ryan Eslinger over 7 years ago

TI__Guru 55940 points

Hi Patrick,

As TLV755P is a fixed output LDO there is no way to break the feedback loop in order to perform these tests. Is the customer looking for this information to determine stability? The best way to determine if an LDO is stable under the application conditions is to use a prototype board such as the EVM and perform transient tests while observing the output response.

Very Respectfully,
Ryan

0 Patrick Chen(TPE System & Application) over 7 years ago in reply to Ryan Eslinger

TI__Expert 3430 points

Hi Ryan,

May I have your help to teach us how to know if the LDO is stable or not by the transient test?
What kind of response that we see will be consider stable or have enough margin?

Thanks,

0 Ryan Eslinger over 7 years ago in reply to Patrick Chen(TPE System & Application)

TI__Guru 55940 points

Hi Patrick,

The following Application Report can be used as a reference. Many customers have their own threshold for what is considered stable or enough margin.

www.ti.com/.../slva381b.pdf

Very Respectfully,
Ryan

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TLV755P: Gain margin and phase margin