K0900E70 Datasheet, PDF (130/224 Pages) Teccor Electronics – Thyristor Product Catalog

AN1002
Application Notes
Sensitive
SCR
G
*
A
K
A
Power
SCR
K
G
The following table and Figure AN1002.9 show the relationship of
gating, latching, and holding of a 4 A device.
Parameter
I_GT (mA)
I_L (mA)
I_H (mA)
Typical 4 A Triac Gating, Latching,
and Holding Relationship
Quadrants or Operating Mode
Quadrant I Quadrant II Quadrant III Quadrant IV
10
17
18
27
12
48
12
13
10
10
12
12
*
MT2
MT2
Sensitive
Triac
G
MT1
Power
Triac
MT1
G
* Resistor is provided for limiting gate
current (I_GTM) peaks to power device.
Figure AN1002.8 “Amplified Gate” Thyristor Circuit
QUADRANT II
(mA)
I_H(+)
20
10
QUADRANT I
I_GT (Solid Line)
I_L (Dotted Line)
50
40
30
20
10 0
10
10
20
30
40
(mA)
Figure AN1002.9
QUADRANT III
20
I_H(–)
QUADRANT IV
Typical Gating, Latching, and Holding Relationships of 4 A Triac at 25 °C
The relationships of gating, latching, and holding for several
device types are shown in the following table. For convenience
all ratios are referenced to Quadrant I gating.
Devices
4 A Triac
10 A Triac
15 A Alternistor
1 A Sensitive SCR
6 A SCR
Typical Ratio of Gating, Latching, and Holding Currents at 25 °C
Ratio
-I-^G-----^T---⁽---I--I---⁾
I_GT(I)
1.6
1.5
1.5
–
–
-I-^G-----^T---⁽---I--I--I---⁾
I_GT(I)
2.5
1.4
1.8
–
–
-I-^G-----^T---⁽---I--V----⁾-
I_GT(I)
2.7
3.1
–
–
–
---I--^L---⁽---I--⁾--
I_GT(I)
1.2
1.6
2.4
25
3.2
--I--^L---⁽---I--I--⁾-
I_GT(I)
4.8
4.0
7.0
–
–
-I-^L----⁽---I--I--I--⁾
I_GT(I)
1.2
1.8
2.1
–
–
-I-^L----⁽--I---V----⁾
I_GT(I)
1.3
2.0
–
–
–
-I--^H-----⁽--+----⁾-
I_GT(I)
1.0
1.1
2.2
25
2.6
---I--^H----(-----)--
I_GT(I)
1.2
1.6
1.9
–
–
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AN1002 - 4
©2002 Teccor Electronics
Thyristor Product Catalog