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
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
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.