high side measurement

[shetty_18]

Controlling Proportional valves using PWM

hii...i am relatively newbie to electronics..

i have this circuit which works fine..i have attached circuit here...
the circuit has outputs CH_P and CH_N across which proportional valve (Burkert 2824) is connected

there is a low side current sensing, but i am required to change the circuit to high side sensing., and i am planning to use LT6101 which has a sense amplifier and a comparator.

could anyone explain me the working of this circuit please.

In this cicuit, PWR is 24V, PWM is from FPGA, I_SET value is coming from a DAC, I_DIAG is a current diagnosis signal.

If i want to use this circuit for high side measurement, how can i do that...?

Thanks for the replies in advance...!
cheers

 

[dick_freebird]

I'd take a look at the new Touchstone high side current
sense ICs.

 

[crutschow]

It's generally better to use a dedicated high-side current measurement IC then to try to build your own.

 

[shetty_18]

Re: Controlling Proportional valves using PWM

hii...i am very sorry..the LT Ic which i specified is wrong...it LT6108 is the correct IC which i want to use and NOT LT6101..very sorry