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DRV5057: Duty Cycle Peak-to-Peak Jitter

Hao Wang14
Expert 4415 points
Part Number: DRV5057

Hi Team,

The datasheet tells the duty cycle peak-to-peak jitter is ±0.1%D, how to understand this spec?

For example, if the output duty cycle is 50% PWM when B is 0mT in theory, will the actual output duty be 49.9%(50%-0.1%)~50.1%(50%+0.1%) or 49.95%(50%-50%*0.1%)~50.05%(50%+50%*0.1%)?

Another question, will the output duty cycle change or keep the same when the temperature changes while B is constant? For example, if the output duty cycle is 50% PWM when B is 0mT at 25℃, will the output duty cycle still be 50% when the temperature is 50℃? If not, is there any tested data about the temperature drift for output duty cycle?

Thanks and Best Regards!

Hao

  • 0
    TI__Mastermind 27950 points

    Hao,

    In the case of a a 50% PWM, your first description of the duty cycle peak-to-peak jitter range is correct: 49.9%(50%-0.1%)~50.1%(50%+0.1%).

    In the case when B is 0mT across temperature, the duty cycle should remain at 50%. The value that has not been published is how much the jitter error may change across temperature. Changes to temperature have a more significant impact on the magnetic field strength, but this device features magnet temperature compensation to counteract how magnets drift for linear performance across a wide –40°C to +125°C temperature range.