1, Get a DCDC chip should test what parameters: ripple, power efficiency and dynamic response.
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1) Ripple measurement method: oscilloscope coupling mode choose AC; The grounding of the oscilloscope probe can not be used with the alligator clip, so the grounding wire will be very long, introducing unnecessary interference, to use the grounding spring, the probe measurement position should be placed on the DCDC output decoupling capacitor seat, the grounding spring connected to the grounding end of the same capacitor, the probe should be 1:1 probe.