MAC8 SERIES

3–48

Motorola Thyristor Device Data

Figure 8. Critical Rate of Rise of Off-State Voltage

(Exponential)

RG, GATE TO MAIN TERMINAL 1 RESISTANCE (OHMS)

5000

4K

3K

2K

1K

0

1000

100

10

1

Figure 9. Critical Rate of Rise of

Commutating Voltage

(di/dt)c, RATE OF CHANGE OF COMMUTATING CURRENT (A/ms)

tw

VDRM

(di/dt)c =

6f ITM

1000

f =

1

2 tw

TJ = 125°C

100

°C

75

°C

10

60

100

10

1

LL

1N4007

400 V

+

MEASURE

I

–

CHARGE

CONTROL

CHARGE

TRIGGER

NON-POLAR

CL

51

2

1

1N914

G

200 VRMS

ADJUST FOR

ITM, 60 Hz VAC

Note: Component values are for verification of rated (dv/dt)c. See AN1048 for additional information.

Figure 10. Simplified Test Circuit to Measure the Critical Rate of Rise of Commutating Voltage

15

20

25

30

35

40

45

50

55

4.5K

3.5K

2.5K

1.5K

1K

1K

500

MT2 POSITIVE

MT2 NEGATIVE