Datasheet

TMC4361A Datasheet | Document Revision 1.22 • 2017-JAN-12
132/230
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to technical change reserved. Download newest version at: www.trinamic.com .
Read entire documentation; especially the “Supplemental Directives” on page 224.
 MAIN MANUAL 
In Figure 54 below, the calculation of minimum/maximum PWM duty cycles with
PWM_AMPL = 32767 is shown on the left side. Resulting duty cycles for different
positions in the sine voltage curve are depicted on the right side. Calculated delays of
minimum/maximum duty cycles are also shown.
Figure 57: Calculation of PWM Duty Cycles (PWM_AMPL)
NOTE:
 If hold current scaling is enabled, see section 11.1. , page 121, HOLD_SCALE_VAL
is used for PWM scaling during standstill.
PWM Scale
Example
PWM_SCALE
VACTUAL
PWM_VMAX
(PWM_AMPL+1)
2^17
0.5
t
DUTY_CYCLE
PWM_VMAX
PWM_FREQ
f
CLK
t
DUTY_MAX
=(0.5+PWM_SCALE)•PWM_FREQ/f
CLK
t
DUTY_MIN
=(0.5–PWM_SCALE)•PWM_FREQ/f
CLK
VACTUAL
t
voltage(V)
t
t
0.5•PWM_FREQ
f
CLK
t
I
II
IIII
II
III