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LM62014 -- EVM Schematic

Rob Rodrigues
Mastermind 19780 points
Other Parts Discussed in Thread: LM3017, LMR62014

Hi Team,

 

I am using an LM62014 EVM and observed the following behavior.  When applying ground to the shutdown pin, the device stops switching but the output voltage follows the input voltage.

 

I have looked at the LM62014 datasheet at the typical application circuit and this appears to be normal behavior for the circuit shown, but I want to verify that it is the same circuit on the EVM.

 

Is there a schematic for the LM62014 EVM?  Does the design of the circuit on the EVM lend itself to that behavior?  Do all boost topology converters have this same tendency?

 

Regards,

  • 0
    TI__Genius 15810 points
    Rob,
    On the boost topology, the FET/switch is on the low side. When the EN signal turns the FET off, the FET is now in open state. Therefore the output voltage now reads Vin, because Vin is always present across the inductor. All the boost topology will exhibit this unless there is input side FET that is also controlled with that EN signal. LM3017 is such a device. The LMR62014 EVM schematic is in the document: http://www.ti.com/lit/ug/snva500a/snva500a.pdf

    Regards,
    Akshay
  • 0 in reply to Akshay Mehta
    TI__Mastermind 19780 points
    Thanks for the quick reply, Akshay. I found the EVM schematic after I posted the question and figured the FET was being kept in the open position when the device is shutdown thus sending the input voltage to the output through the 10uH inductor.

    Regards,