K0900E70 Datasheet, PDF (167/224 Pages) Teccor Electronics – Thyristor Product Catalog

Application Notes
AN1006
To continue testing, perform the following procedures.
Procedure 9: V_TM(Forward)
To measure the V_{TM (Forward)} parameter:
1. Set Left-Right Terminal Jack Selector to correspond with
the location of the test fixture.
2. Increase Variable Collector Supply Voltage until current
reaches rated I_T(peak), which is 1.4 times the I_T(RMS) rating of
the sidac.
Note: Model 370 current is limited. Set to 400 mA. Check for
1.1 V MAX.
WARNING: Limit test time to 15 seconds.
3. To measure V_TM, follow along horizontal scale to the point
where the trace crosses the I_T(peak) value. This horizontal dis-
tance is the V_TM value. (Figure AN1006.25)
VTM
IPK
PER
V
E
500
R
T
mA
DIV
PER
H
O
R
500
I
mV
Z
DIV
PER
S
T
E
P
()k
DIV
9m
PER
DIV
Figure AN1006.25 V_{TM (Forward)} = 950 mV at I_PK = 1.4 A
Procedure 10: V_TM(Reverse)
To measure the V_{TM (Reverse)} parameter:
1. Set Polarity to (–).
2. Repeat Procedure 8 to measure V_TM(Reverse).
Diacs
Diacs are voltage breakdown switches used to trigger-on triacs
and non-sensitive SCRs in phase control circuits.
Note: Diacs are bi-directional devices and can be connected in
either direction.
To connect the diac:
1. Connect one side of the diac to the Collector Terminal (C).
2. Connect other side of the diac to the Emitter Terminal (E).
To begin testing, perform the following procedures.
Procedure 1: Curve Tracer Setup
To set the curve tracer and begin testing:
1. Set Variable Collector Supply Voltage Range to 75 Max
Peak Volts. (80 V on 370)
2. Set Horizontal knob to sufficient scale to allow viewing of
trace at the required voltage level (10 V to 20 V/DIV depend-
ing on device being tested).
3. Set Vertical knob to 50 µA/DIV.
4. Set Polarity to AC.
5. Set Mode to Norm.
6. Set Power Dissipation to 0.5 W. (0.4 W on 370)
7. Set Terminal Selector to Emitter Grounded-Open Base.
Procedure 2: V_BO
To measure the V_BO parameter:
1. Set Left-Right Terminal Jack Selector to correspond with
the location of the test fixture.
2. Set Variable Collector Supply Voltage to 55 V (65 V for
370) and apply voltage to device under test (D.U.T.), using
Left-Right-Selector Switch. The peak voltage at which cur-
rent begins to flow is the V_BO value. (Figure AN1006.26)
IBO
VBO
+IBO
+VBO
PER
V
E
50
R
T
A
DIV
PER
H
O
R
10
I
V
Z
DIV
PER
S
T
E
P
()k
DIV
9m
PER
DIV
Figure AN1006.26 (+)V_BO = 35 V; (-)V_BO = 36 V; (±)I_BO < 15 µA;
(-)I_BO < 10 µA and Cannot Be Read Easily
Procedure 3: I_BO
To measure the I_BO parameter, at the V_BO point, measure the
amount of device current just before the device reaches the
breakover mode. The measured current at this point is the I_BO
value.
Note: If I_BO is less than 10 µA, the current cannot readily be seen
on the curve tracer.
Procedure 4: ∆V_{BO(Voltage Breakover Symmetry)}
To measure the ∆V_{BO (Voltage Breakover Symmetry)} parameter:
1. Measure positive and negative values of V_BO as shown in
Figure AN1006.26.
2. Subtract the absolute value of V_BO(-) from V_BO(+).
The absolute value of the result is:
∆V_BO = [ I +V_BO I - I -V_BO I ]
©2002 Teccor Electronics
Thyristor Product Catalog
AN1006 - 15
http://www.teccor.com
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