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DRV8912-Q1: do we have thermal test report

Elec Cheng
Expert 7055 points
Part Number: DRV8912-Q1

Hi Expert,

Our customer would like to use DRV890X-q1 in a door control unit. Now they have some concern about its thermal performance. As shown in datasheet, the normal output current is 1A RMS. They will use two half bridge to driver a motor as H bridge. They would to evaluate the worst case. Now one DRV8912-Q1 drives 6 motor, which means all 12 channels are all used. The nominal output current is 1A RMS. What's the thermal performance of DRV8912-Q1? Or normally, for 1A RMS load current, what's the duty cycle do you recommend with 12CHs? It will be great if you can share related test report. Thanks.

BR,

Elec Cheng

  • 0
    TI__Genius 17728 points

    Hey Elec,

    Please see section 9.3 Thermal Application in the datasheet, it discusses how to calculate total power dissipation for your exact system specs.  Also read to 9.3.5 Device Junction Temperature Estimation.  I couldn't find any other internal documents for this chip relating to thermal information.  

    This device supports continuous mode (without PWM) or chopping mode (with PWM), so you can select the duty cycle that you want.  8.3.1.1 Control Modes

    I will say that 1A RMS seems very close to the overcurrent trip point IOCP of 1.8 A peak ( 1.3A min / 1.8A typical / 2.3A max).  You might want to use a duty cycle that will keep the current below 1A, or at least keep the peak time to be less than tOCP.  

    Regards,

    Jacob