STK672-430AN-E Datasheet, PDF (23/26 Pages) ON Semiconductor – 2-phase Stepper Motor Driver

STK672-430AN-E
6. Mitigated Curve of Package Power Loss, PdPK, vs. Ambient Temperature, Ta
Package power loss, PdPK, refers to the average internal power loss, PdAV, allowable without a heat sink.
The figure below represents the allowable power loss, PdPK, vs. fluctuations in the ambient temperature, Ta.
Power loss of up to 3.1W is allowable at Ta=25C, and of up to 1.75W at Ta=60C.
* The package thermal resistance θc-a is 25.8°C/W.
Allowable power dissipation, PdPK (no heat sink) - Ambient temperature, Ta
3.5
3
2.5
2
1.5
1
0.5
0
0
20
40
60
80
100
120
Ambient temperature, Ta - °C
No.A2270-23/26