AMC1100: Protect the AMC1100 when the shunt is open

Bottini Roberto

Part Number: AMC1100

Hi,

In my application I need to measurement the load bidirectional current with a isolated power supply. The load is a DC with max 60Vdc/200A (max ±250mv ).

I wanted to use the AMC1100 Fully-Differential Isolation Amplifier in a High-Side measurement configuration (with floating 5V power supply, VCC1) and I want protect the AMC1100 when the shunt is open.

Can I use the circuit here without measurement accuracy problems ?

Thanks

over 9 years ago

0 Tom Hendrick over 9 years ago

TI__Guru**** 182821 points

Hi Botinni!

Welcome to our e2e forum! Can you tell me more about what DC2+ and DC2- will be connected to and why you have soncerns about the shunt being open? With a quick look over your schematic, the LM device will add some Vcm to the VinN terminal but I can't tell what the VinP terminal might do with respect to SGNDB.

0 Bottini Roberto over 9 years ago in reply to Tom Hendrick

Prodigy 215 points

The shunt is connecting to Dc2+ and Dc2 label. It's not mount on pcb and is not near the electronic device. The Lm is necessary for negative measurement (reverse current). If I remove Lm the min reverse current is 160mv. Suggest?

0 Tom Hendrick over 9 years ago in reply to Bottini Roberto

TI__Guru**** 182821 points

Hi Bottini,

Can we take this conversation off line for the moment? Send me a friend request or I can contact you at your registered e-mail address, whichever is easier for you.

0 Bottini Roberto over 9 years ago in reply to Tom Hendrick

Prodigy 215 points

Hi Tom
No problem. You can use my registered email.
Best Regards

Robert

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AMC1100: Protect the AMC1100 when the shunt is open