INA185: output distortion issue

Yang Wu

Expert 3470 points

Part Number: INA185
Other Parts Discussed in Thread: INA240

Tool/software:

Hi team,

My customer reported INA185 output distortion issue for the inductor current sampling application.

So, I did a simulation in Tina with 10KHz triangle current, and also found similar issue.

Customer waveform:

Do you have some ideas about this issue and how we can solve it? thanks a lot.

Best regards,

Yang

10 months ago

0 Yang Wu 10 months ago

TI__Expert 3470 points

Attach sim file:

INA185.tsc

0 Mallika Senthil 10 months ago in reply to Yang Wu

TI__Expert 8560 points

Hi Yang,

What you're seeing on the scope shot is common mode transient response. This is characteristic of the INA185 and within specs mentioned in the datasheet.

This isn't an issue per say, but to minimize this you'd have to change devices to something with robust PWM rejection, like the INA240.

Best,
Mallika Senthil

Amplifiers

Amplifiers forum

INA185: output distortion issue