DRV110: Peak current drop at high temperature

Davide Rossi

Part Number: DRV110

Hi Everybody,

I'm using the DRV110 as a solenoid driver and I set the peak current to 900mA and the hold current to 150mA. I made some environmental test for my application and I found out that, for temperature higher than 55°C, the peak current drops from 900mA to 250mA roughly, while the hold current stay at the same value. I made some measurement with a current transducer and I found out that this current value is constant and repeatable along all the project supply voltage range (from 23V to 42V), and it seems to be strictly related to temperature, despite the working operating range of -40°C to +125°C

Can anyone help me?

Best Regards

Davide Rossi

over 6 years ago

0 Aaron Goodson over 6 years ago

TI__Expert 6330 points

Hi David,

I have notified our expert regarding this topic. Please expect a response by 10/25/18.

Thanks,
Aaron

0 Costin Cazana over 6 years ago

TI__Expert 4940 points

Hi Davide,

What is the load and the Rsense values?

I'd like to bench check your conditions, seems to me an external current limitation.

Regards,

Costin

0 Davide Rossi over 6 years ago in reply to Costin Cazana

Prodigy 20 points

Hi Costin,

the Rsense is 1ohm while the electromagnet DC resistance is 25ohms.

Thank You Very Much

Best Regards

Davide

0 Costin Cazana over 6 years ago in reply to Davide Rossi

TI__Expert 4940 points

Hi Davide,

I bench checked it up to 125C and don't see Ipeak or Tkeep drop. In my set-up the load is: R=15ohm and L=7mH.
I'll close this thread, please open a new thread if you have some additional set-up info.

Regards,
Costin

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DRV110: Peak current drop at high temperature