Questions 11-13 refer to the following information. The SCR of Fig. 3 has gate t
ID: 2290901 • Letter: Q
Question
Questions 11-13 refer to the following information. The SCR of Fig. 3 has gate trigger voltage VT = 0.7V, gate trigger current IT = 10 mA and holding current IH-8 mA. VCC = + 15 V 1002 out Please note: Holding current: It is the maximum anode current, gate being open, at which SCR is turned off from ON conditions. To turn off the SCR the anode current must be made equal to the holding current. 11. What is the output voltage Vo in Volts when the SCR is off? 12. What is the input voltage Vin (Volts) that triggers the SCR? 13. If Vcc is decreased until the SCR opens, at what value of VCC (Volts) will the SCR turn off?Explanation / Answer
11)when SCR is off then the output voltage is Vout=VCC=15V
12)VT=0.7V, IT=10mA
Voktage drop across R of 1kohms=10*1=10volts
Vin needed for triggering of SCR= 10+0.7=10.7V
13)VCC= IH*R+0.7= 8*1+0.7=8.7V
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