Hi,

I'm working with the Amplifier ADA4700, I would like to make this below circuit. In the datasheet (see in this attach) I can see :

High output current drive: 30 mA thus The power at the terminal resistor is about 90 V (if Vin =10V) = 2.7W

Then If I take a resistor R2=100 Ko standard at 1/4 W, it is not enough for my electronic assembly is this correct my thought ?. I suppose the correct resistor is 100 Ko at 4W for R2. Thanks for your helps

Hi,

May I know what your load resistance is?

The power rating of your resistor can be taken with the power formula P =(V^2/R)

During no load, the power will be taken solely by R2, assuming linear operation at Vs+ = 100V, Vs- = GND, P = (98V^2/100kohm), which is 96mW. Which means 1/4W resistor is more than enough.

Regards,

Goz