TMC4671 Datasheet • IC Version V1.00 | Document Revision V1.04 • 2018-Dec-11
146 / 157
Figure 37: Phase current measurement: Current directions for 2 and 3 phase motors
Figure 38: Phase current measurement: Current direction for DC or Voice Coil Motor
There are two main options for measuring the phase currents as described above. First option is to use
a shunt resistor and a shunt amplifier like the LT1999 or the AD8418A. The other option is to use a real
current sensor, which uses the Hall effect or other magnetic effects to implement an isolated current
measurement. Shunt measurement might be the more cost-effective solution for low voltage applications
up to 100V, while current sensors are more useful at higher voltage levels.
In general the sample circuit in fig. 39 can be used for shunt measurement circuitry. Please consider
design guidelines of shunt amplifier supplier additionally. TRINAMIC also supplies power stage boards
with current shunt measurement circuitry (TMC-UPS10A/70V-EVAL). For current measurement also current
©2018 TRINAMIC Motion Control GmbH & Co. KG, Hamburg, Germany
Terms of delivery and rights to technical change reserved.
Download newest version at www.trinamic.com
TRINAMIC [ TRINAMIC MOTION CONTROL GMBH & CO. KG. ]
