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RAA306012 RSSK User's Manual
4.3.1.2
Protection Circuits
The Evaluation Board has a protection circuit that detects overcurrent from the U, V, and W phase shunt
currents. The overcurrent detection circuit judges that an overcurrent state has occurred when any among the
U, V, and W phase currents exceeds the threshold. The threshold can be adjusted by variable resistor VR301.
The overcurrent detection signal OC# is High when the shunt current value is within the threshold range and
Low when an overcurrent is detected. Therefore, as long as the MOSFETs and RAA306012 are not broken,
the Evaluation Board and the motor are protectable by monitoring the overcurrent detection signal OC# and
forcing the timer output port into Low to make the MOSFET turn off. The overcurrent detection circuit does not
provide direct protection of the Evaluation Board and the motor. It is necessary to perform appropriate
processing on the MCU and/or use the protection function of RAA306012, to provide protection.
Shunt Current
(via amplifier)
I
_OPA
U
I
_OPA
V
I
_OPA
W
R12UZ0128EJ0100
Rev.1.00
Nov 1, 2023
Volume
（VR301）
Figure 4-7 Overcurrent Detection Circuit
4. Peripheral Circuits
OC#
Over Current
Signal
Page 58 of 76
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