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Power supply USB C Lenovo Model: ADLX65YDC3A

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student8b

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Hi
I have a problem testing the power supply. I connected the resistor R visible in the diagram. The resistor can be values in the range from 2k4 to 7k5 and then we have output voltage 5V. I have a question how to get a voltage of 20V? I don't have any idea. I tried with different resistors but to no avail. I have also used various Lenovo ThinkPad schemes but they are not clear to me.

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As far as I'm aware of, the resistor programming can only modify the current delivery at safe Vbus of 5 V. To negotiate a higher Vbus up to 20V, a digital communication protocol through CC pin has to be implemented. See USB C spec for details, chapter 4.6 Power.
 

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