Thermal specifications

Parameter

Value

Notes

Operating ambient temperature

0 to +40 °C

2.0 A per phase on both axes†


0 to +50 °C

phase current ≤ 1.2 A on both axes†

Storage temperature

−40 to +85 °C

design value from component ratings†

Cooling

natural convection; the drivers are coupled to the enclosure base by thermal pads


Major heat sources (design values)†:

Source

Estimated dissipation

Conditions

Motor drivers

≈ 2.0 W each

2.0 A peak per phase, hot


≈ 0.45 W each

0.95 A (factory setting)

Motor-side 5 V regulator

≈ 1.2 W (up to 2.4 W)

24 V motor supply

Logic supply regulators

≈ 1.8 W

12 V logic supply, full load

Opto input circuits

≈ 1.0 W

15 V opto supply, all 16 inputs on

Fuses and reverse-protection MOSFETs

≈ 0.6–0.9 W

3.0 A motor supply

Derating and mounting 

Mount the unit with the base against a metal surface where possible: the drivers are coupled to the base by thermal pads and the base acts as the heat sink. Leave free air around the cover. The motor-supply fuses derate with temperature (Section 9.1).