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DRV2510-Q1: Overtemperatur fault @ 300mA load

Nicolás Román
Intellectual 960 points
Part Number: DRV2510-Q1

Dear team,

could you help me with the following issue? 

Using the DRV2510 with a load below 200mA everything works as expected. 

When the DRV2510 is set to drive around 200-300mA into the coil (or more), it works for close to 1 second, detects and reports an over-temperature and enters load diagnostics mode, and resumes to working around 1 second later, and so on. When touching the chip it feels almost cold.

Some additional information:
VDD =15.4V.
The logic is at 3.3V (EN pin for instance).
Between the coil terminals is a simple coil used as an actuator in series with a negligible sense resistor.
Using less input decoupling than what the DS recommends, but a test were it was increased did not solve the issue.

Attached below is the a shot of the schematic and PCB the DRV2510 is used in.

Looking forward to your feedback.

BR, Nico 

  • 0
    TI__Guru** 108895 points
    Hi Nico,

    How did you know over-temp was triggered? I noticed I2C and INTZ pins floating.
    Can you measure REG pin voltage when device is working and when it is not?
    What is your input signal? Are you using differential signal or just input to one side? I would recommend to try placing AC coupling capacitors at the inputs. This device also features DC offset protection (this is not mentioned in data sheet, we're adding this in the next update in a few weeks).

    Best regards,
    -Ivan Salazar
    Applications Engineer - Low Power Audio & Actuators
  • 0 in reply to Ivan Salazar
    Prodigy 20 points
    Hello Ivan,

    Thank you for your answer. I'm the person that actually did the testing and ran into this issue.
    - In order to know what the error was I hooked up the I2C pins to a microcontroller using extra wires. Reading the register 0x01 showed that the bit OVER_TEMP is at 1 when the chip stops working and at 0 otherwise.
    - I didn't have a look at the REG pin voltage, and unfortunately I can't measure it today. If needed though I'll try to do that later on.
    - The 2 inputs are connected directly to 2 DACs of a microcontroller. Both of them output 3.3 / 2 = 1.65V when no current is desired in the load, and then the voltage of one of them is slightly increased (and decreased for the other one, symmetrically) or the other way depending on the desired current in the load.

    Best regards,
    Sylvain
  • 0 in reply to Sylvain Mange
    TI__Guru** 108895 points
    Hi Sylvain,

    Can you add AC coupling capacitors at the inputs of DRV2510-Q1 as mentioned before. This device features DC protection so I just want to make sure this is not the cause of the device not being able to continue its operation.
    Although I still wonder why overtemp flag is triggered even if device is not hot at touch.

    Best regards,
    -Ivan Salazar
    Applications Engineer - Low Power Audio & Actuators
  • 0 in reply to Ivan Salazar
    TI__Guru** 108895 points
    Sylvain,

    Were you able to test the suggestion above?
    What is the status of your application? Is it working fine now?

    Best regards,
    -Ivan Salazar
    Applications Engineer - Low Power Audio & Actuators
  • 0 in reply to Ivan Salazar
    Prodigy 20 points
    Hi Ivan,

    Sorry that I didn't reply earlier, I was away from office. I haven't been able to test with AC coupling capacitors, because we moved our efforts towards another solution. But we might get back to the DRV2510-Q1 later on, I'll keep you updated then.

    Thank you for your help!

    Best regards,
    Sylvain