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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
datasheetspdf.com

DTA144WSA datasheet

DTA144WSA - DTA144WE / DTA144WUA / DTA144WKA / DTA144WSA Transistors Digital transistors (built-in resistor) DTA144WE / DTA144WUA / DTA144WKA / DTA144WSA zFe.
datasheetspdf.com datasheetspdf.com

DTC144WSA datasheet
datasheetspdf.com

DTC144WSA datasheet

DTC144WSA - DTC144WE / DTC144WUA / DTC144WKA / DTC144WSA Transistors Digital transistors (built-in resistors) DTC144WE / DTC144WUA / DTC144WKA /DTC144WSA zFe.
datasheetspdf.com datasheetspdf.com
 

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  • L4978 Shutdown.pdf
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