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Tool/software:
Hi support team,
Why are the voltages of VOUT and VOUT/FB different in TEST CONDITIONS?
Aren't they directly connected?
Regards,
Dice-K
Hi Dice-K,
I believe I see where the confusion is. The "Fixed 5.0-V Vout" designates the trim of the part used i.e. LMR43620MB5RPER.
To take the "non-switching" input current at VOUT/FB and VIN, we supply a voltage to the output to hold FB high to make the device's control loop "believe" it is regulating properly. This way, the device is not switching and we can determine the current consumption of the input pins and the bias pins on their own, whereas if the device was otherwise operating normally, these signals would not be isolated and there would be no way for us to determine the contributions of these pins to the overall power consumption of the device.
Thank you,
Joshua Austria