AC08FSM datasheet(164/223 Pages) TECCOR

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AN1006

Application Notes

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AN1006 - 12

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7. Set Terminal Selector to Emitter Grounded-Open Base.

Procedure 5: VBO (Positive and Negative)

To measure the VBO (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 VBO value.

(Figure AN1006.19)

Figure AN1006.19 (+)VBO = 35 V; (-)VBO = 36 V; (±)IBO < 10 A

Procedure 6: IBO (Positive and Negative)

To measure the IBO (Positive and Negative) parameter, at the VBO point,

measure the amount of device current just before the device

reaches the breakover point. The measured current at this point

is the IBO value.

Note: If IBO is less than 10 µA, the current cannot readily be seen

on curve tracer.

Procedure 7:

∆VBO (Voltage Breakover Symmetry)

To measure the

∆VBO (Voltage Breakover Symmetry) parameter:

1. Measure positive and negative VBO values per Procedure 5.

2. Subtract the absolute value of VBO (-) from VBO (+).

The absolute value of the result is:

∆VBO = [ I+VBO I - I -VBO I ]

Procedure 8: VTM (Forward and Reverse)

To test VTM, the Quadrac must be connected the same as when

testing VBO, IBO, and

∆VBO.

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 IT(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 VTM 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 VTM (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 IT(RMS) rating of the device IT(peak) on the CRT.

Procedure 9: VTM(Forward)

To measure the VTM (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 IT(peak), which is 1.4 times the IT(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 VTM, follow along horizontal scale to the point

where the trace crosses the IT(peak) value. This horizontal dis-

tance is the VTM value. (Figure AN1006.20)

Figure AN1006.20 VTM (Forward) = 1.1 V at IPK = 5.6 A

Procedure 10: VTM(Reverse)

To measure the VTM (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 IT(peak).

4. Measure VTM(Reverse) the same as in Procedure 8. (Read mea-

surements from upper right corner of screen).

PER

DIV

PER

DIV

PER

()k

DIV

PER

DIV

VBO

IBO

+VBO

+IBO

500

PER

DIV

PER

DIV

PER

IPK

VTM

()k

DIV

PER

DIV

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