AC08FSM datasheet(167/223 Pages) TECCOR

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Application Notes

AN1006

AN1006 - 15

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To continue testing, perform the following procedures.

Procedure 9: VTM(Forward)

To measure the VTM (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 IT(peak), which is 1.4 times the IT(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 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 AN1006.25)

Figure AN1006.25 VTM (Forward) = 950 mV at IPK = 1.4 A

Procedure 10: VTM(Reverse)

To measure the VTM (Reverse) parameter:

1. Set Polarity to (–).

2. Repeat Procedure 8 to measure VTM(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: VBO

To measure the VBO 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 VBO value. (Figure AN1006.26)

Figure AN1006.26 (+)VBO = 35 V; (-)VBO = 36 V; (±)IBO < 15 µA;

(-)IBO < 10 µA and Cannot Be Read Easily

Procedure 3: IBO

To measure the IBO parameter, at the VBO point, measure the

amount of device current just before the device reaches the

breakover mode. 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 the curve tracer.

Procedure 4:

∆VBO(Voltage Breakover Symmetry)

To measure the

∆VBO (Voltage Breakover Symmetry) parameter:

1. Measure positive and negative values of VBO as shown in

Figure AN1006.26.

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

The absolute value of the result is:

∆VBO = [ I +VBO I - I -VBO I ]

500

PER

DIV

PER

DIV

PER

()k

DIV

PER

DIV

VTM

IPK

PER

DIV

PER

DIV

PER

()k

DIV

PER

DIV

+VBO

+IBO

IBO

VBO

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