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OPA1633: Temperature exceed 60℃

Chris Peng
Prodigy 560 points
Part Number: OPA1633

Dear BU friend:

My customer faced OPA1633 thermal problem exceed 60℃ when the input is 10V and output is about 2V. The output connect to ADC directly.

Is it normal?

Here is the schematic and waveform of the input and output.

The yellow is the input, the green is output and it scaled down 5 times.

  • 0
    TI__Genius 15060 points

    Hi Chris,

    Are the signals they are seeing still their expected results based off their configuration? The device temperature in the 60℃ range is not out of the expected range for amplifiers as this will depend on the type of package the customer is using as well as the power dissipated from the device as the two major factors. If the customer is seeing the expected result meaning, there is not some oscillation occurring that is pushing the device to dissipate more power and is causing the temperature to rise, then it is likely the operating temperature of the device with the current configuration the device is in. The concern for permanent damage is when the device is in the 150℃ range which they are still well below. 

    Best Regards,

    Ignacio

  • 0 in reply to Ignacio Vazquez Lam1
    TI__Prodigy 560 points

    Thanks for your reply. What's the influence of the package? Which package is better for the thermal dissipation.

    And is there any suggestion for the PCB layout?  The customer develop battery test system. This temperature caused other chip's large temperature drift.

  • 0 in reply to Chris Peng
    TI__Genius 15060 points

    Hi Chris,

    The OPA1633 is available in both an SOIC-D package and DGN package. The DGN package has a thermal pad which significantly improves the thermal performance of the device. Section 6.4 in the datasheet highlights the thermal performance for each package. As for PCB layout techniques, section 8.4 in the datasheet highlights good practices for the PCB layout as well as an example layout to follow for this device.

    Best Regards,

    Ignacio