LM25011: PGD and EN connection

Hirotsugu Kobayashi

Mastermind 8745 points

Part Number: LM25011

Hi team,

Can I connect the SS of LM25011 and PGD directly?

Is it a problem if I don't use pull-up resistors for PGD?

Best Regards,

over 2 years ago

0 Daniel Li14 over 2 years ago

TI__Mastermind 27030 points

connect SS to PGD wil let the deivce impact by PGDstatues, when PGD =low, LM5011 will be no output, when PGD go high, as PGD is open drain structure, SS capacitor will charge by internal ss current and external charging current from the pull up voltage.

if no pull up resistor, PGD will not go high.

Thanks

0 Hirotsugu Kobayashi over 2 years ago in reply to Daniel Li14

Mastermind 8745 points

Hi,

This circuit configuration is used to form a sequence.

Since the SS terminal has an internal PU, I think it will work with this configuration.

Will PGD go High without a pull-up resistor?

+1 Daniel Li14 over 2 years ago in reply to Hirotsugu Kobayashi

TI__Mastermind 27030 points

if PGD don't connect any other circuit, it won't go higher as it is open drain structure.

And LM25011 internal SS have pull up current, so for sequence, I think it is OK .

0 Daniel Li14 over 2 years ago in reply to Hirotsugu Kobayashi

TI__Mastermind 27030 points

if PGD don't connect any other circuit, it won't go higher as it is open drain structure.

And LM25011 internal SS have pull up current, so for sequence, I think it is OK .

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LM25011: PGD and EN connection