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TI Home » TI E2E Community » Support Forums » Power Management » AC/DC and Isolated DC/DC Power » AC/DC and Isolated DC/DC Power Forum » LM5030 Pull up voltage of current source into SS pin
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LM5030 Pull up voltage of current source into SS pin

LM5030 Pull up voltage of current source into SS pin

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S.Satoshi
Posted by S.Satoshi
on Jul 26 2012 05:48 AM
Genius3465 points

Hi,

The 7.7V series regulator in LM5030 should be enabled at start up, and the ENABLE signal should be from shutdown comparator.

Then the pull up voltage of current source into SS pin should be generated from VIN because Vcc can not be regulated before voltage at SS pin is rised.

Is my understanding correct?

Best Regards,

LM5030
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  • Terry Allinder
    Posted by Terry Allinder
    on Jul 26 2012 17:01 PM
    Intellectual1810 points

    The current source for the ss is generates from an internal VDD a low voltage regulated bias. So no it is not regulated from VIN, or VCC.

    Terry

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  • S.Satoshi
    Posted by S.Satoshi
    on Jul 26 2012 19:37 PM
    Verified Answer
    Verified by S.Satoshi
    Genius3465 points

    Hi Terry-san,

    Thank you for your response.

    I understand that there is Vdd into LM5030 which is not stated in block diagram and it's regulated from VIN, not VCC.

    Best Regards,

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