Is ADP7159 (or ADP7157, .. ADM715*) REF_SENSE pin driven by external DAC acceptable?
I wanto control the voltage with a SPI/DAC.
like https://ez.analog.com/power/f/q-a/100035/lt3090-output-voltage-controlled-by-dac
Hi,
Controlling the output of ADP715x and ADM715x linear regulators using an external DAC is possible. You can control the output voltage to your desired value by adding/subtracting a margining current (IMARGIN) at the REF_SENSE pin.
VOUT = VREF_SENSE + VR_TOP ± ∆VMARGIN
Since VREF_SENSE is constant, the change in output voltage (∆VMARGIN) is dependent in IMARGIN and RTOP.
∆VMARGIN = IMARGIN x RTOP
Below are some related readings regarding this method.
https://www.analog.com/en/technical-articles/voltage-margining-made-easy.html
https://www.analog.com/media/en/technical-documentation/data-sheets/LTC7106-1.pdf
https://www.analog.com/media/en/technical-documentation/data-sheets/292012fa.pdf
Regards,Errgy
Thank you for your reply.
If you find any problems, please point out, thank you.
ltspice_ADP7159_EZone_2020_0220.zip