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AMC3302: Shunt measurement of LC-load in H-bridge

Part Number: AMC3302

Hi.

We switch a series LC-load in a 600V H-bridge.

Today we measure the current using a transducer (LEM HO- series) 

I wanted to try to use a shunt instead. So connected a shunt in series with the load.

Connected a AMC3302EVM board, connected 5V power to the board and measure the output.

At 16 kHz I had about 100A of current (Says the HO) in a nice triangle wave.

But the output of the EVM board shows an almost square wave.

Now I wonder where I was wrong. Clearly I am wrong somehow.

So I am thinking that perhaps the AMC3302 is wrong for this. Looked good but not designed for this application.

or

I have made an error in my setup of the EVM board. Not much to connect but still managed to get it wrong..

or

I am completely wrong about the current being triangle shaped.