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DRV8873-Q1: Heat issue under 50KHz with load

Cherry Zhou
Mastermind 22235 points
Part Number: DRV8873-Q1
Other Parts Discussed in Thread: DRV8873

Hi team,

The test conditions are as follows:

  • supply power: 12V
  • Single current with a load: 1.5A
  • PWM drive frequency: 50KHz 

The temperature rise will soon be around 100C. The temperature will drop to about 90C when the frequency is reduced to 20 kHz.

Issues:

1) The device supports up to 50kHz according to the DRV8873 manual. Why is it hot? 

2) The load requirement is 50KHz, otherwise there will be an odd noise. Is there any way to solve the problem of getting hot apart from reducing the frequency?

The circuit diagram is as follows:

Could you help check this case? Thanks.

Best Regards,

Cherry

  • 0
    TI__Guru 55615 points

    Cherry,

    Please see the following section in the datas

    heet with a calculation for switching losses.  This is expected behavior.

    8.2.1.2 Drive Current and Power Dissipation

    To reduce switching losses, slew rate can be adjusted with SPI register.  Faster slew rate results in lower switching losses.

    Regards,

    Ryan