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PS22A72

TRANSFER MOLDING TYPE

INSULATED TYPE

Publication Date : January 2012

6

Fig. 4 Timing Charts of DIPIPM Protective Functions

[A] Short-Circuit Protection (N-side only with the external sense resistor and RC filter)

a1. Normal operation: IGBT ON and outputs current.

a2. Short circuit current detection (SC trigger)

(It is recommended to set RC time constant 1.5~2.0μs so that IGBT shut down within 2.0μs when SC occurs.)

a3. All N-side IGBT's gates are hard interrupted.

a4. All N-side IGBTs turn OFF.

a6. Input = “L”: IGBT OFF

a7. Fo finishes output, but IGBTs don't turn on until inputting next ON signal (L

H).

(IGBT of each phase can return to normal state by inputting ON signal to each phase.)

a8. Normal operation: IGBT ON and outputs current.

H).

(IGBT of each phase can return to normal state by inputting ON signal to each phase.)

b2. Normal operation: IGBT ON and outputs current.

b4. All N-side IGBTs turn OFF in spite of control input condition.

b7. Normal operation: IGBT ON and outputs current by next ON signal (L

H).

Lower-side control

input

Protection circuit state

Internal IGBT gate

Output current Ic

Sense voltage of

the sense resistor

Error output Fo

SC

trip current level

a2

SET

RESET

SC reference voltage

a1

a3

a6

a7

a4

a8

a5

Delay by RC filtering

RESET

SET

RESET

b1

b2

b3

b4

b6

b7

b5

Control input

Protection circuit state

Output current Ic

Error output Fo