Please suggest an on-board power supply design for ade7880 using input phase voltages.
Also what voltage source is being used in the evaluation board to give Vdd(3.3V)?
An external 3.3V from a power supply is needed to power up the ADE IC-side of the board. The MCU-side of the board can be powered up by the USB connection itself. Unfortunately, we do not have any recommended power supply reference designs for ADE7880. However, you may refer to one of our older Meter Reference Designs here.This document contains a power supply schematic which might give you an idea of the implementation.
Is there any need to give separate analog(AVdd) and digital(DVdd) voltage supplies for ADE 7880 or
the VDD will take care of that internally?
Thanks a lot!
Just providing VDD would be fine. The entire part powers up from it.
Can you elaborate what you are looking for? Do you need to know what power supply we are using totest Evaluation boards or do you need the design for power supply decoupling circuit in the Evaluation board? To repeat it again, we are using an instrument to supply power to the Eval board and any power supply unit that could satisfy the maximum current limitations of the part can be used.
I am actually looking for a simple onboard Capacitor power supply for ADE side of the energy meter design.
But for now i am taking it from mcu side as we have 1.5amps max current supply on mcu side.
Also i am using 2 ADE ICs.
So please let me know whether i can go with above solution or recommend me with some other supply.
Kindly attach your power supply design schematic here so that I can give my suggestions.
I am attaching image of ade side power supply.
I will be using either RC supply or external 5V supply.
Apart from following the regulator recommendations, kindly make sure to have 10 uF and 0.1 uF caps in parallel attached to the VDD pin of the ADE7880. It would also be beneficial to decouple with another 0.1uF cap at the regulator output. In your layout, if you have a lot of transfer points for the supply( i.e. like a drop to a plane), make sure it is decoupled with a 0.1 uF cap at that point as well.
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