INA215: Question about max frequency.

David Kim2

Part Number: INA215

Equipment using INA215 limits current to PWM.
Distortion occurs in the INA215 output when the PWM frequency is 10 kHz or more.
Is there a way to remove the distortion? Or please recommend a product that is available.

Thanks

over 1 year ago

0 Carolus Andrews over 1 year ago

TI__Mastermind 19515 points

David,

Unfortunately the BW of the INA215 is most likely the issue here. If the current in the load line is being PWM'd at 10kHz, this means that the fundamental frequency itself is at the limits of the BW of the device, and while the BW of the INA215 is 40kHz, most of the harmonic content forming the remainder of the square wave is being truncated by the bandwidth itself:

If this is the case, unfortunately there is no way to restore this lost information. You would need to move to a part with additional bandwidth to be able to pass more artefacts of the full waveform.

0 David Kim2 over 1 year ago in reply to Carolus Andrews

Expert 2860 points

Hi Carolus

Thank you for your support.

" additional bandwidth to be able to pass more artefacts of the full waveform."

=>Please recommend a possible product.

Thanks

0 kai klaas69 over 1 year ago in reply to David Kim2

Guru 140200 points

Hi David,

have you already looked here?

https://www.ti.com/amplifier-circuit/current-sense/analog-output/products.html

Kai

0 Carolus Andrews over 1 year ago in reply to David Kim2

TI__Mastermind 19515 points

David,

What specifications drew you originally to the INA215? I can make a blanket recommendation that would provide additional bandwidth, but it would be good to understand your system a bit better to make a more suitable one. Off the cuff, I would say have a look at the INA296. This is one of our newer devices that has a wide bandwidth which would ensure you see the totality of the signal, and it also possesses high speed response metrics (5V/us).

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INA215: Question about max frequency.