VLA500-02 데이터 시트보기 (PDF) - Isahaya Electronics
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VLA500-02 Datasheet PDF : 6 Pages
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OPERATION OF PROTECTION CIRCUIT
(1) In case the gate voltage is “H” and the collector voltage is high,
this Hybrid IC will recognize the circuit as short circuit and immediately
reduce the gate voltage . Besides, put out a fault sign (“L”) which
inform that protection circuit is operating at the same time from pin 28 .
(2) The protection circuit reset and resorted to ordinary condition if input
sign is “L” when the predetermined time(1 ~ 2ms) passed.
(“L” period needs 15us or more )
(3) When the output rises, the controlled time detect short circuit
(Typ 2.8us) is set up so that on-time of IGBT can be secured properly.
It is possible to adjust that time by connecting the capacitor (Ctrip)
between pin 21,22 and 29.
HYBRID IC
VLA500-02
DRIVER FOR IGBT MODULES
ADJUSTMENT OF OUTPUT FALL TIME
(When the protection circuit is operating)
In case you want to decrease the speed of reverse bias when the
protection circuit is operating, you can adjust that speed by connecting
the capacitor (Cs) between pin 21,22 and 27.
(Please refer to under figures. )
INPUT
SIGNAL
t2
t1
90%
50%
OPERATION FLOW ON DETECTING SHORT CIRCUIT
Vo
10%
0%
START
DETECTION OF
SHORT CIRCUIT
GATE SHUTDOWN
CIRCUIT OPERATE
TIMER START
OUTPUT FAULT SIGN
1 ~ 2ms
NO
END OF TIMER
YES
NO
INPUT SIGN IS “L”
YES
RESET
Note : “L” output voltage with protection circuit operating is about VEE + 2V.
t1,t2 VS. Cs CHARACTERISTICS
(TYPICAL)
50
45 VD=15V
40 Ta=25deg.
35
30
25
t2
20
15
10
t1
5
0
0 100 200 300 400 500 600 700 800
CONNECTIVE CAPACITANCE Cs (pF)
(PIN:27-21)
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