Question: a. Using Fig. 17.24b, determine the minimum irradiance required to fire the device at room temperature (25C). b. What percentage reduction in irradiance is allowable

a. Using Fig. 17.24b, determine the minimum irradiance required to fire the device at room temperature (25°C).
b. What percentage reduction in irradiance is allowable if the junction temperature is increased from 0°C (32°F) to 100°C (212°F)?

Fig. 17.24b

40 20 10 Triggering region 0.8 0.6 No units trigger in this area 0.4 0.2 Notes: (1) Shaded area represents the locus of possible triggering points from -65C to 100C (2) Applied anode voltage= 6 V de (3) Gate to cathode resistance = 56,000 (4) Light source perpendicular to plane of header. 0.1 0.08 0.06 0.04 -60 -40 -20 20 40 60 80 100 Junction temperature (C) (b) TIL | 2. Effective irradiance (mW/cm2)

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