ftf-ind-f1273.pdf

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Introducing a temperature dependent current limit for motor drivers. This thermal management scheme ensures high efficient operation by reducing switching losses when the motor is experiencing heavy loads or binding.  In the presentation we will discuss factors determining power dissipation in a motor driver integrated circuit examining dynamic and steady state operation and the effect on junction temperature. We will review how to calculate an estimate of power dissipation using the information provided in a typical motor driver data sheet. With an understanding of how power is dissipated in a motor driver, we will introduce a new system using temperature dependent current limit that will protect both the driver and the motor.

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