TMCM-1076 Hardware Manual • Hardware Version V1.10 | Document Revision V1.00 • 2018-JUN-25
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1.2 TRINAMIC’s Unique Features
1.2.1 stealthChop™
stealthChop is an extremely quiet mode of operation for low and medium velocities. It is based on a voltage
mode PWM. During standstill and at low velocities, the motor is absolutely noiseless. Thus, stealthChop
operated stepper motor applications are very suitable for indoor or home use. The motor operates
absolutely free of vibration at low velocities. With stealthChop, the motor current is applied by driving
a certain effective voltage into the coil, using a voltage mode PWM. There are no more configurations
required except for the regulation of the PWM voltage to yield the motor target current.
Figure 1: Motor coil sine wave current using stealthChop (measured with current probe)
1.2.2 spreadCycle™
The spreadCycle chopper is a high-precision, hysteresis-based, and simple to use chopper mode, which
automatically determines the optimum length for the fast-decay phase. Several parameters are available to
optimize the chopper to the application. spreadCycle offers optimal zero crossing performance compared
to other current controlled chopper algorithms and thereby allows for highest smoothness. The true target
current is powered into the motor coils.
Figure 2: spreadCycle principle
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