LMV431 oscillations

Girish Krishnaiah

Other Parts Discussed in Thread: LMV431

I am using LMV 431 as series pass regulator with mosfet ZVN4525. reglating to 9.5V.

TLVH 431 data sheet has stability boundaries defined with oscillations area. 4th area corresponds to oscillation where Vka=18V.

LMV431 does not show this area in data sheet for Vka=18 or other voltage. Any one is having stability area curves for LMV431 regulator?

over 11 years ago

0 Girish Krishnaiah over 11 years ago

Prodigy 50 points

Another Point.. Pole zero stability of this scheme is different from whats oscillation condition thats mentioned in typical shunt regulator datasheet?. for me it looks like they are different and both need to be met...

0 Don Schelle over 8 years ago in reply to Girish Krishnaiah

TI__Expert 4150 points

Hello,

One of my customers is experiencing a reference voltage change when noise in the 300kHz range injected into the circuit from an adjacent transformer. I too am looking for stabliity curves on this part.

Do they exist?

Don

0 Don Schelle over 8 years ago in reply to Don Schelle

TI__Expert 4150 points

Hello,

I haven't received a response yet. Do these curves exist?

Don

0 Jocelyn Chang over 8 years ago in reply to Don Schelle

TI__Prodigy 55 points

Hi Don,Any curves that we have for this device will be in the datasheet.Thanks,
Jocelyn

0 Girish Krishnaiah over 8 years ago in reply to Jocelyn Chang

Prodigy 50 points

after reading many datasheets of 431 famility finally added a cap from pass FET to ground to solve this problem. actually this can also be solved by putting a cap at reference divider to ground.

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LMV431 oscillations