BAV20WS-TP datasheet(26/47 Pages) INFINEON

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User Manual

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Revision 1.4

2020-07-16

EVAL-M3-IM564 User Manual

iMOTION™ Modular Application Design Kit

Hardware description of EVAL-M3-IM564

4.2.2

Motor external current feedback configuration and calculation

The current input value is a product of the shunt resistance in milliohms and gain of external current sense

amplifier for EVAL-M3-102T, as shown in Figure 21.

Figure 21 Current shunt feedback and sample timing for EVAL-M3-102T

The external amplifier gain circuit can be found in the schematics or user manual for the control board (for

example, EVAL-M3-102T see Figure 22).

Figure 22 depicts IU+ current feedback sensing circuity on the EVAL-M3-102T evaluation board. Please note that

the default external gain is 5/6 for the EVAL-M3-102T control board. However, since the EVAL-M3-IM564 power

board has been configured with an external op-amp with a gain of 10, the following modifications to the circuit

of the EVAL-M3-102T control board are recommended for more accurate gain calculations.The resistor R10 on

the EVAL-M3-102T needs to be removed and R13 needs to be change to 0 ohm.

Figure 22 The part of current feedback on the EVAL-M3-102T evaluation board

R12

100ohm 1/10W 1%

R13

2Kohm 1/10W 1%

R10

10Kohm 1/10W 1%

C21

220pF

+3.3V

IU+

Rsh

Ish

iMOTION

Controller

Current shunt resistor

on power board

R13 change to 0 ohm

Delete R10

EVAL-M3-IM564

EVAL-M3-102T

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