DRV8818_16 Datasheet, PDF (22/31 Pages) Texas Instruments – Stepper Motor Controller IC

DRV8818
SLVSAX9E – SEPTEMBER 2011 – REVISED JANUARY 2016
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Thermal Considerations (continued)
I_OUT(RMS) is equal to the approximately 0.7x the full-scale output current setting. The factor of 4 comes from the
fact that there are two motor windings, and at any instant two FETs are conducting winding current for each
winding (one high-side and one low-side).
The maximum amount of power that can be dissipated in the DRV8818 is dependent on ambient temperature
and heatsinking. The thermal dissipation ratings table in the datasheet can be used to estimate the temperature
rise for typical PCB constructions.
Note that R_DS(ON) increases with temperature, so as the device heats, the power dissipation increases. This must
be taken into consideration when sizing the heatsink.
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