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LM25088: How to interface an LVTTL signal to enable the LM25088 when used to generate a negative voltage?

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Part Number: LM25088

I am using an LM25088 to convert from +19V to -12V.

I would like to be able to control the enable of the LM25088.

But, since the part is reference to -12V instead of GND, I don't think that a 3.3V signal can drive the enable signal directly.

How can I interface a 3.3V signal to enable the LM25088 when used to generate a negative voltage?

The circuit is shown below.

  • Roger,

    You can use a level shifter. Either an IC or discrete.

    -Sam

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