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PS22A72
TRANSFER MOLDING TYPE
INSULATED TYPE
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.
a5. F O outputs with a fixed pulse width determined by the external capacitor C FO .
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.
Lower-side control
input
a6
Protection circuit state
SET
RESET
a3
Internal IGBT gate
a4
SC trip current level
a8
Output current Ic
Sense voltage of
a1
a2
SC reference voltage
a7
the sense resistor
Delay by RC filtering
Error output Fo
a5
[B] Under-Voltage Protection (N-side, UV D )
b1. Control supply voltage V D exceeds under voltage reset level (UV Dr ), but IGBT turns ON by next ON signal (L 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.
b3. V D level drops to under voltage trip level. (UV Dt ).
b4. All N-side IGBTs turn OFF in spite of control input condition.
b5. Fo outputs for the period determined by the capacitance C FO, but output is extended during V D keeps below UV Dr .
b6. V D level reaches UV Dr .
b7. Normal operation: IGBT ON and outputs current by next ON signal (L H).
Control input
Protection circuit state
RESET
SET
RESET
Control supply voltage V D
UV Dr
b1
UV Dt
b3
b6
Output current Ic
Error output Fo
b2
b4
b5
b7
Publication Date : January 2012
6
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