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Q: TPS62130 /40/50 EVM loop gain - Bode plot measurement by 9092
In Section 1.3.4 of the TPS62130 EVM we discuss how to make loop measurements by adding a 10ohm resistor between Vout and Vos and cutting a trace. My customer wants the capability to test this on any board by placing a zero ohm jumper between Vout and Vos for production and replacing this with a 10ohm resistor if he needs to take any loop measurements. Is this acceptable? I ask because we show a trace between the two pins on the EVM schematic and ask the customer to cut a trace to do loop measurements. Also, we do not even show this on the EVM schematic. Is a reason we do not want customer placing a zero ohm between these two pins? Any adverse side effects?
Q: Re: TPS62130/40/50 EVM by 10449
Yes, you can measure the TPS62130, TPS62140, TPS62150, TPS62160, and TPS62170 loop gain by implementing the circuit you have described. You will not experience any performance issues with the circuit when you have the zero ohm resistor installed. We do not show the circuitry on the EVM schematic because the resistor pads on the back of the PWB are just poured copper, not an actual component.
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