FAM65V05DF1

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13

TIMING CHART PROTECTIVE FUNCTION

Figure 20. Short−Circuit Current Protection

SC Reference Voltage

Fault Output Signal

SC

SET

RESET

A1

A2

A3

A4

A5

A8

A6

A7

Lower arms

control input

Protection

circuit state

Lower arms

gate input

Output Current

Sensing Voltage

tFOD

Step

Description

A1

A2

A3

A4

A5

A6

A7

A8

Normal operation. IGBT on and carrying current

Short−circuit current threshold reached

Protection function triggered

IGBT turns off with soft turn−off

Fault output activated (initial delay 2 ms, tFOD min. 50 ms)

IGBT “LO” input

IGBT “HI” input is ignored

Current stays at zero during fault state