LMR51430: SW transinet

Brian Wang0928

Part Number: LMR51430
Other Parts Discussed in Thread: TLV62569

Team, I'm confused about the voltage derating 38V,max for SW_Transient <20nS. Why is it 38V at this condition? Is that correct?

Regards

Brian

0 richard chiang over 1 year ago

I think they are in conflict

0 Colin Chen over 1 year ago

Hi Brain,

It means the overshoot of SW rising shouldn't beyond 38V and undershoot of SW falling shouldn't lower than -3V.

B R

Colin

0 Brian Wang0928 over 1 year ago in reply to Colin Chen

I know the TLV62569 has SW voltage rating with a transient time. it's high than max. voltage. but in this spec, i don't see the similar one, why?

Regards

Brian

0 Colin Chen over 1 year ago in reply to Brian Wang0928

Hi Brian,

This is depend on parameter of internal mos. For higher Vin range, SW voltage rating with a transient time is different as well.

B R

Colin

0 Brian Wang0928 over 1 year ago in reply to Colin Chen

I'm confused with you meaning. Do you mean this device have the identical stress for DC, SW, and SW with a period of trasient time?

Regards

Brian

0 Colin Chen over 1 year ago in reply to Brian Wang0928

Hi Brian,

Yes, the positive stress of DC SW and SW with a period of transient time are same, they are both equal to 38V.

And negative stress are different, DC SW is -0.3V, SW with a period of transient time is -3V.

B R

Colin

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