MAC15 SERIES

3–58

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

10000

1000

100

10

Figure 9. Critical Rate of Rise of

Commutating Voltage

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

VD = 800 Vpk

TJ = 125°C

ITM

tw

VDRM

(di/dt)c =

6f ITM

1000

f =

1

2 tw

TJ = 125°C

100

°C

75

°C

10

100

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

20

30

40

50

60

70

80

90