Datasheet

TMC4361A Datasheet | Document Revision 1.22 • 2017-JAN-12
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Read entire documentation; especially the “Supplemental Directives” on page 224.
 MAIN MANUAL 
In this example, the following scale options are enabled:
 Boost scaling on acceleration ramps
 Drive scaling 1 and 2
As long as | VACTUAL | < VDRV_SCALE_LIMIT, Drv1 scaling is active. Both drive scaling
modes are used for the deceleration ramp because boost current is not enabled during
deceleration slopes ( boost_current_on_dec = 0).
Whenever VACTUAL traverses 0 the RAMP_STATUS switches to acceleration ramp,
and boost scaling becomes enabled again.
This is shown in Figure 53 A. Figure 53 B depicts the actual scale parameter, which
is altered with the formerly specified delays. In contrast to example 1, t
START_SCALE
is
changed to the following calculation:
t
DN_SCALE
= ( BOOST_SCALE_VAL – DRV1_SCALE_VAL ) · DRV_SCALE_DELAY · f
CLK
Whereas the other transition phases depend on whether DRV1_SCALE_VAL or
DRV2_SCALE_VAL is used either; before or after the transition process.
Figure 56: Scaling Example 2
Scaling Mode
Example 2
v(t)
t
t
SCALE_PARAM
VDRV_SCALE_LIMIT
-VDRV_SCALE_LIMIT
Boost scaling
Drv1 scaling
Drv2 scaling
BOOST_SCALE_VAL
DRV1_SCALE_VAL
DRV2_SCALE_VAL