CoolStep+ works with StallGuard+ by closing the loop between real-time load feedback and motor current regulation. CoolStep+ automatically adjusts motor current based on the actual mechanical load instead of using a constant maximum current.
At the system level, CoolStep+ monitors the StallGuard+ load indicator (SG_RESULT) and dynamically scales motor current. Current is automatically reduced under light load while increasing resistance, such as during plunger acceleration or the onset of an occlusion, prompts a controlled current increase to preserve torque margin. This closed-loop behavior allows the motor to traverse load transients smoothly without excess energy dissipation or loss of positional integrity.
During light-load operation, it reduces power consumption, motor heating, and battery drain, while increasing current only when additional torque is needed.
For medical pumps, reduced heat is more than an efficiency benefit: it directly supports drug integrity, patient safety, and long-term reliability. By minimizing motor self-heating, CoolStep+ helps protect heat-sensitive therapeutics while reducing the need for bulky thermal mitigation. Lower average motor current also reduces acoustic excitation, complementing StealthChop+ to maintain quiet operation throughout long infusion cycles.
Together, StealthChop+ and CoolStep+ enable infusion pumps to operate quietly while minimizing heat generation near sensitive drugs, lowering enclosure temperature, and supporting smaller form factors with fewer thermal design constraints. In battery-powered pumps, improved efficiency enables longer run time or smaller batteries, delivering clear benefits for portable medical devices.
Applicable Part Numbers
| Digikey Part Number | Manufacturer Part Number |
|---|---|
| 175-TMC5262AFV±ND | TMC5262AFV+ |
| 175-TMC5262AFV+TTR-ND,175-TMC5262AFV+TCT-ND,175-TMC5262AFV+TDKR-ND | TMC5262AFV+T |
| 175-TMC5262-EVKIT-ND | TMC5262-EVKIT |