Hello everyone. I have a 24VDC bidirectional brush motor with a 24VDC 15A pwm controller, functioning quite well. The motor draws about 250ma no load with a stall current of a few amps.
I am attempting to create a current sensing circuit using TI's INA195 highside current sensing shunt monitor chip. I have a 0.022ohm 50W sense resistor for voltage sensing.
My main problem is that the transient voltages produced from the start / stop forward / reverse action of the motor has destroyed the first INA195 chip i've tested. Here is a basic circuit diagram of my test circuit so far.
Vload is the motor side, Vsupply is the controller side. Vout is 0-5v analog signal.
I am unsure of which transient suppressor to use (moreso what ratings). The INA195 can handle common mode voltages up to 80V so I am assuming the transients have been in excess of that. Do I need a clamping voltage of about 50v?
Basically I'm worried if I go for a transzorb with 50v clamp rating, a transient voltage of 200v may destroy the transient supressor.
All of the transient suppressors I have looked at haven't had a maximum voltage rating.
Any help would be appreciated... thanks
I am attempting to create a current sensing circuit using TI's INA195 highside current sensing shunt monitor chip. I have a 0.022ohm 50W sense resistor for voltage sensing.
My main problem is that the transient voltages produced from the start / stop forward / reverse action of the motor has destroyed the first INA195 chip i've tested. Here is a basic circuit diagram of my test circuit so far.
Vload is the motor side, Vsupply is the controller side. Vout is 0-5v analog signal.
I am unsure of which transient suppressor to use (moreso what ratings). The INA195 can handle common mode voltages up to 80V so I am assuming the transients have been in excess of that. Do I need a clamping voltage of about 50v?
Basically I'm worried if I go for a transzorb with 50v clamp rating, a transient voltage of 200v may destroy the transient supressor.
All of the transient suppressors I have looked at haven't had a maximum voltage rating.
Any help would be appreciated... thanks