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Comparison of 2 shutdown circuits?

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cupoftea

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What is the possible advantage of shutting down the L4978 IC with circuit A rather than circuit B? (attached). [ie, shut down L4978 when Vcc rail goes below 29V]
[The L4978 is shut down by taking SS pin to Ground].

L4978 datasheet

DTA144WSA datasheet

DTC144WSA datasheet
 

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