FNB33060T Datasheet, PDF (12/15 Pages) Fairchild Semiconductor – Motion SPMR 3 Series

Lower arms
control input
Protection
Circuit state
SET
c6 c7
RESET
Internal IGBT
Gate-Emitter Voltage
c4
c3
c2
Internal delay
at protection circuit
SC current trip level
c8
c1
Output Current
Sensing Voltage
of sense resistor
SC Reference Voltage
Fault Output Signal
RC Filter circuit
c5 time constant
delay
Figure 13. Short-Circuit Current Protection (Low-Side Operation only)
(with the external sense resistance and RC filter connection)
c1 : Normal operation: IGBT ON and carrying current.
c2 : Short circuit current detection (SC trigger).
c3 : All low-side IGBT’s gate are hard interrupted.
c4 : All low-side IGBTs turn OFF.
c5 : Fault output operation starts with a fixed pulse width.
c6 : Input HIGH: IGBT ON state, but during the active period of fault output the IGBT doesn’t turn ON.
c7 : Fault output operation finishes, but IGBT doesn’t turn on until triggering next signal from LOW to HIGH.
c8 : Normal operation: IGBT ON and carrying current.
Input/Output Interface Circuit
MCU
4.7 kΩ
+5V (MCU or Control power )
SPM
IN_(UH) ^, IN_(VH) ^, IN_(WH)
IN_(UL) ^, IN_(VL) ^, IN_(WL)
V_FO
COM
Figure 14. Recommended CPU I/O Interface Circuit
Note:
13. RC coupling at each input might change depending on the PWM control scheme used in the application and the wiring impedance of the application’s printed circuit board.
The input signal section of the Motion SPM 3 product integrates 5 k(typ.) pull-down resistor. Therefore, when using an external filtering resistor, please pay attention to the sig-
nal voltage drop at input terminal.
©2016 Fairchild Semiconductor Corporation
12
FNB33060T Rev. 1.1
www.fairchildsemi.com