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TPS54620EVM- Lineaarity, repeatability and stability: Input voltage vs output current..

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Nasir Ahmed posted on 5 Nov 2009 9:44 AM

Hi:

 

I am currently evaluating this and wanted measure output current vs input voltage.  I am thinking of moving R7 (0) to R8 and using amplier to measure voltage difference between TP8 & TP7.  The idea to get a measure of current.  I have done another similiar cicuit using discrete components.  Any idea? 

 

Also, I am trying to use a generic op-amp to increase my voltage from 0-10V to 5-15V.  Any suggestion?

 

Thanks.

Nasir

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Texas Instruments Employee

I am not sure what you are trying to do.  R7 (and TP7) are used for closed loop stability measurements.  Depending on the type of network analyser that you use, you can remove R7 to open the loop or replace the 0 ohm resistor with 50 ohms to use the Venable analysers like we use in our lab.  Output current is not a function of input voltage, it is dependent on the load resistance attached from J7-1 to J7-2.

John Tucker

DC/DC Applications

"Your source for all things SWIFT"

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