K0900E70 Datasheet, PDF (164/224 Pages) Teccor Electronics – Thyristor Product Catalog

AN1006
Application Notes
7. Set Terminal Selector to Emitter Grounded-Open Base.
Procedure 5: V_{BO (Positive and Negative)}
To measure the V_{BO (Positive and Negative)} 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 on
370) and apply voltage to the device under test (D.U.T.)
using the Left Hand Selector Switch. The peak voltage at
which current begins to flow is the V_BO value.
(Figure AN1006.19)
VBO
+IBO
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 AN1006.19 (+)V_BO = 35 V; (-)V_BO = 36 V; (±)I_BO < 10 A
Procedure 6: I_{BO (Positive and Negative)}
To measure the I_{BO (Positive and Negative)} parameter, at the V_BO point,
measure the amount of device current just before the device
reaches the breakover point. 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 curve tracer.
Procedure 7: ∆V_{BO (Voltage Breakover Symmetry)}
To measure the ∆V_{BO (Voltage Breakover Symmetry)} parameter:
1. Measure positive and negative V_BO values per Procedure 5.
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 ]
Procedure 8: V_{TM (Forward and Reverse)}
To test V_TM, the Quadrac must be connected the same as when
testing V_BO, I_BO, and ∆V_BO.
To connect the Quadrac:
1. Connect MT1 to Emitter Terminal (E).
2. Connect MT2 to Collector Terminal (C).
3. Connect Trigger Terminal to MT2 Terminal through a 10 Ω
resistor.
Note the following:
• Due to the excessive amount of power that can be generated in
this test, only parts with an I_T(RMS) rating of 8 A or less should be
tested on standard curve tracer. If testing devices above 8 A, a
Tektronix model 176 high-current module is required.
• A Kelvin test fixture is required for this test. If a Kelvin fixture is
not used, an error in measurement of V_TM will result due to volt-
age drop in fixture. If a Kelvin fixture is not available,
Figure AN1006.3 shows necessary information to wire a test
fixture with Kelvin connections.
To measure the V_{TM (Forward and Reverse)} parameter:
1. Set Terminal Selector to Emitter Grounded-Open Base.
2. Set Max Peak Volts to 75 V. (80 V on 370)
3. Set Mode to Norm.
4. Set Horizontal knob to 0.5 V/DIV.
5. Set Power Dissipation to 220 watts (100 watts on a 577).
6. Set Vertical knob to a sufficient setting to allow the viewing
of 1.4 times the I_T(RMS) rating of the device I_T(peak) on the CRT.
Procedure 9: V_TM(Forward)
To measure the V_{TM (Forward)} parameter:
1. Set Polarity to (+).
2. Set Left-Right Terminal Jack Selector to correspond with
the location of the test fixture.
3. Increase Variable Collector Supply Voltage until current
reaches rated I_T(peak), which is 1.4 times the I_T(RMS) rating of
the triac under test.
Note: Model 370 current is limited to 10 A.
WARNING: Limit test time to 15 seconds maximum.
4. 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 AN1006.20)
VTM
IPK
PER
V
E
1
R
T
A
DIV
PER
H
O
R
500
I
mV
Z
DIV
PER
S
T
E
P
()k
DIV
9m
PER
DIV
Figure AN1006.20 V_{TM (Forward)} = 1.1 V at I_PK = 5.6 A
Procedure 10: V_TM(Reverse)
To measure the V_{TM (Reverse)} parameter:
1. Set Polarity to (–).
2. Set Left-Right Terminal Jack Selector to correspond with
the location of the test fixture.
3. Increase Variable Collector Supply Voltage until current
reaches rated I_T(peak).
4. Measure V_TM(Reverse) the same as in Procedure 8. (Read mea-
surements from upper right corner of screen).
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AN1006 - 12
©2002 Teccor Electronics
Thyristor Product Catalog