IC-SP-06027 R0
8. Inverter IC Handling Note
8-1. Electrical static destruction of VSP pin caused by external surge
Cause
Phenomenon
Countermeasure
The external surge on the VSP line of the motor was put into IC directly.
The VSP signal is not transmitted in IC, and the motor doesn't rotate.
The series resistance is inserted so that the external surge is not put into IC directly.
In addition, if capacitor is added, it becomes more effective.
<Pin name of Motor>
VSP pin
Inverter IC
GL pin
<Motor populated board>
VSP
GND
Fig. 8-1. Example to configuration for external parts of VSP
8-2. Electrical static destruction of FG pin caused by external surge
Cause
Phenomenon
Countermeasure
The external surge on the FG line of the motor was put into IC directly.
The FG signal of the IC is not monitored.
The buffer circuit using the transistor is used on the motor populated board so that
the external surge is not put into IC directly.
<Terminal name of Motor>
CB pin
Inverter IC
FG pin
FG
GL pin
<Motor populated board>
GND
Fig. 8-2. Example to configuration for external parts of FG (CMOS output case)
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