NFVA23512NP2T

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12

Figure 11. Short−Circuit Current Protection (Low−Side Operation Only)

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.

Output Current

Fault Output Signal

Sensing Voltage

of Sense Resistor

Lower Arms

Control Input

Protection

Circuit State

Internal IGBT

Gate−Emitter Voltage

SET

RESET

SC current trip level

SC reference voltage

Internal delay

at protection circuit

RC filter circuit

time constant

delay

c1

c2

c3

c4

c5

c6

c7

c8

c6: Input HIGH: IGBT ON state, but during the active period of fault output the IGBT doesn’t turn ON.

(with the external sense resistance and RC filter connection)

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.

Figure 12. Recommended CPU I/O Interface Circuit

COM

+5V (MCU or Control power)

(WH)

4.7 kΩ

INPUT/OUTPUT INTERFACE CIRCUIT

MCU

ASPM

NOTE:

14.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 2 product integrates 5 kW (typ.) pull−down resistor.

Therefore, when using an external filtering resistor, please pay attention to the signal voltage drop at input terminal.