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Original question:

DRV103: DRV103H IC heating beyond the temperature limit specified when PWM output is turned ON

DRV103: DRV103H IC heating beyond the temperature limit specified when PWM output is turned ON

kirubakar Nagarajan
Prodigy 80 points
Part Number: DRV103
Other Parts Discussed in Thread: DRV104

Hi Team,

We have tried all your suggestions and from our end also we reverified our design and re-spin the PCBA as well. We couldn't see any difference in PWM Output, output is continuously turned ON and IC is heating more than the operating temperature. Since from your end, the device seems to good and working fine. So we like to have one evaluation board which you had for your testing's and reference.

It will be very helpful for us if the evaluation board is sent for our testing from TI. If the Evaluation board is chargeable, same will be barred from our end. So kindly do the needful to proceed with our testing.

Thanks in advance by Kirubakar Nagarajan

  • 0
    TI__Genius 16145 points

    Hi Kirubakar, 

    To clarify, the original issue was the IC exhibits more than +85Deg C in ambient temperature of +25Deg C, correct? 

    Could you explain why you expect a cooler temperature than the 85C measured? Below is the equation you would need to use which would depend on your power dissipation and the board's θja. The DRV103 has a larger θja than the DRV101 so we would expect a larger temperature increase. 

    Power dissipated in the DRV103 will cause its internal junction temperature to rise. The DRV103 has an on-chip thermal shutdown circuitry that protects the IC from damage so the device will be protected. 

    If this increase in temperature is unacceptable for another reason, the DRV104 does offer a lower θja than the DRV103. or a heat sink could be added to the current design. 

    Due to the age of this device, we do not have an evaluation board to provide.

    With regard to alternate devices, 

    Our group now focuses more on integrated Power Switches(integrated FET, DC devices) and so our driver portfolio can be found in a different place. In Power Switches, DRV104 is the most up to date driver device we offer. You can find more recent offerings of solenoid drivers here:

    https://www.ti.com/motor-drivers/solenoid/overview.html

    We also offer High Power Drivers here:

    https://www.ti.com/power-management/gate-drivers/overview.html 

    If you are interested in any of these devices, please create a new thread with one of these devices tagged so the responsible engineer and group will be able to help you choose the right part.

    Best Regards, 

    Elizabeth