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L7987L Not working as expected

Shivalee
Associate II

Hello All,

I am using L7987L to generate +15V from 24V. I have 10 same boards wherein I have used the same circuit (see below), I am able to generate 15V for 2 boards but in rest it is generating 1.22V only. 

Shivalee_0-1753767604520.png

R191 is 6.8kohm and diode D36 is US1M-E3/61T.

SS pin is showing 0.07V only

Please note there was no change in layout for working as well as non-working boards. I have checked all individual resistors as well as replaced IC too. still the issue persists.

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