http://www.ti.com/lit/an/slva504/slva504.pdf
Abstract
When selecting a motor driver IC
for a particular application,
consider the maximum amount of current
that must be driven.
The thermal characteristics of the IC and PCB
are often the limiting factor
in how much current
a given motor provides.
To calculate the maximum allowable current
in a given application,
an estimation of the total motor driver power dissipation
is needed.
This application report shows how to estimate this power dissipation
in DC brush motor
& stepper motor applications.
1 Sources of Power Dissipation in a Motor Driver
1.1 R Dissipation
1.2 Switching Losses
1.3 Operating Supply Current Dissipation
1.4 Other Power Dissipation
2 Example Calculation
2.1 Conditions and Assumptions
2.2 Power Calculation
2.3. Die Temperature Estimation
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