S0700KC17E
| Model | S0700KC17E |
| Description | Symmetrical GTO SCR, 870A I(T)RMS, 1700V V(DRM), 1275V V(RRM), 1 Element |
| PDF file | Total 15 pages (File size: 181K) |
| Chip Manufacturer | IXYS |
WESTCODE
An IXYS Company
t
gq
t
f
0.9
Symmetrical Gate Turn-Off Thyristor type S0700KC17#
V
DM
I
TGQ
V
D
0.1
0.1
V
GR
Q
GQ
V
G(AV)
V
GQ
I
GQ
t
gw
Diagram 11, Turn-off parameter definitions.
In addition to the turn-off figures given in characteristic data, the curves of figures 10, 11 & 12 give the
relationship of I
GQ
Q
GQ
and t
gq
to turn-off current (I
TGQ
) and di
GQ
/dt. Only typical values of I
GQ
are given due
to a great dependence upon the gate circuit impedance, which is a function of gate drive design not the
device. The t
gq
is also, to a lesser extent, affected by circuit impedance and as such the maximum figures
given in data assume a good low impedance circuit design. The curves of figures 17 & 18 give the tail time
and minimum off time to re-fire device as a function of turn-off current. The minimum off time to re-fire the
device is distinct from t
gw
, the gate off time given in characteristics. The GTO thyristor may be safely re-
triggered when a small amount of tail current is still flowing. In contrast, the gate circuit must remain low
impedance until the tail current has fallen to zero or below a level which the higher impedance V
GR
circuit
can sink without being pulled down below –2 Volts. If the gate circuit is to be switched to a higher
impedance before the tail current has reached zero then the requirements of diagram 12 must be applied.
i
tail
R
(V
GR
- i
tail
R)>2V
Diagram 12.
V
GR
The figure t
gw
, as given in the characteristic data, is the maximum time required for the tail current to
decay to zero. The figure is applicable under all normal operating conditions for the device; provided
suitable gate drive is employed. At lower turn-off current, or with special gate drive considerations, this
time may be reduced (each case needs to be considered individually).Typical turn-off losses are given in
the curves of figures 13 & 14, the integration period for the losses is nominally taken to the end of the tail
time (I
tail
<1A) i.e. :-
tgt
+
ttail
Eoff
=
∫
iv
.
dt
.
0
Data Sheet. Type S0700KC17# Issue 1
Page 8 of 15
July, 2004
