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CN0179: 4-20 mA Low Power modify Vsys to 80V

Question asked by kevin.hsu on Nov 9, 2015
Latest reply on Nov 9, 2015 by Brandon


I would like to modify the CN0179 , the link below,



Vsys = 80V

Iout = 4mA ~ 20mA

application : APD testing circuit for optical field


Will update the MOSFET to VDS around 100v , Id=1A


However, After checked the circuit note. I don't sure the A2 AD8657 operation with a Zener diode 18V? if I change Vsys to 80V

anything else I need to change?

please advise, Thanks


Kevin H