P5
Input Signal
Internal IGBT
Gate-Emitter Voltage
SC Detection
P1
Output Current
P4
P6
P7
P2
SC Reference
Sensing Voltage
RC Filter Delay
Voltage (0.5V)
Fault Output Signal
P3
P8
P1 : Normal operation: IGBT ON and conducting current.
P2 : Short-circuit current detection.
P3 : IGBT gate interrupt / fault signal generation.
P4 : IGBT is slowly turned off.
P5 : IGBT OFF signal.
P6 : IGBT ON signal: but IGBT cannot be turned on during the fault-output activation.
P7 : IGBT OFF state.
P8 : Fault-output reset and normal operation start.
Figure 11. Short-Circuit Protection (Low-Side Operation Only)
5V
MCU
100 ?
100 ?
100 ?
R PF =
4.7 k ?
R PL =
2 k ?
R PH =
4.7 k ?
SPM
IN (UH) , IN (VH) , IN (WH)
IN (UL) , IN (VL) , IN (WL)
V FO
1 nF
C PF =
1 nF
C PL =
0.47 nF
C PH =
1.2 nF
COM
Figure 12. Recommended MCU I/O Interface Circuit
3rd Notes:
1. It would be recommended that by-pass capacitors for the gating input signals, IN (UL) , IN (VL) , IN (WL) , IN (UH) , IN (VH) and IN (WH) should be placed on the Motion
SPM ? 2 product pins and on the both sides of MCU and Motion SPM 2 Product for the fault output signal, V FO , as close as possible.
2. The logic input works with standard CMOS or LSTTL outputs.
3. R PL C PL /R PH C PH /R PF C PF coupling at each Motion SPM 2 product input is recommended in order to prevent input/output signals’ oscillation and it should be as
close as possible to each of Motion SPM 2 Product pins.
?2003 Fairchild Semiconductor Corporation
FSAM30SM60A Rev. C8
11
www.fairchildsemi.com
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