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(a) When the switch is closed, the transistor must be driven into saturation, thus applying nearly Vcc across the lamp. Choose R₁ so that for min the transistor is exactly at the boundary of the active (constant-current) and saturation regions. Use a non-standard resistance value if necessary, and express it to 4 significant figures. (b) For your choice of R₁, what is iß, ic, VLAMP, and vCE? (Hint: Use KVL to find VLAMP) What power will be dissipated by the transistor in your design? (c) If R₁ happened to increase by 8%, what would be the new values of iß, ic, ULAMP, UCE, and PD? (You can use either the vi plot or the formula, just state which.) (d) Can you think of any modifications to the circuit that would improve the performance of the system? Describe the modifications and improvement.

(a) When the switch is closed, the transistor must be driven into saturation, thus applying nearly Vcc across the lamp. Choose R₁ so that for min the transistor is exactly at the boundary of the active (constant-current) and saturation regions. Use a non-standard resistance value if necessary, and express it to 4 significant figures. (b) For your choice of R₁, what is iß, ic, VLAMP, and vCE? (Hint: Use KVL to find VLAMP) What power will be dissipated by the transistor in your design? (c) If R₁ happened to increase by 8%, what would be the new values of iß, ic, ULAMP, UCE, and PD? (You can use either the vi plot or the formula, just state which.) (d) Can you think of any modifications to the circuit that would improve the performance of the system? Describe the modifications and improvement.

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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(a) When the switch is closed, the transistor must be driven into saturation, thus applying nearly Vcc across the lamp. Choose R₁ so that for min the transistor is exactly at the boundary of the active (constant-current) and saturation regions. Use a non-standard resistance value if necessary, and express it to 4 significant figures. (b) For your choice of R₁, what is iß, ic, UVLAMP, and VCE? (Hint: Use KVL to find VLAMP) What power will be dissipated by the transistor in your design? (c) If R₁ happened to increase by 8%, what would be the new values of iB, ic, VLAMP, UCE, and PD? (You can use either the vi plot or the formula, just state which.) (d) Can you think of any modifications to the circuit that would improve the performance of the system? Describe the modifications and improvement.
Transcribed Image Text:(a) When the switch is closed, the transistor must be driven into saturation, thus applying nearly Vcc across the lamp. Choose R₁ so that for min the transistor is exactly at the boundary of the active (constant-current) and saturation regions. Use a non-standard resistance value if necessary, and express it to 4 significant figures. (b) For your choice of R₁, what is iß, ic, UVLAMP, and VCE? (Hint: Use KVL to find VLAMP) What power will be dissipated by the transistor in your design? (c) If R₁ happened to increase by 8%, what would be the new values of iB, ic, VLAMP, UCE, and PD? (You can use either the vi plot or the formula, just state which.) (d) Can you think of any modifications to the circuit that would improve the performance of the system? Describe the modifications and improvement.
Design a lamp circuit in which a small control current switches a large lamp current. 15 V, B = 90 Use the transistor circuit below, in which Vcc (min), Vf 0.63 V, Vsat 0.25 V. The maximum power dissipation for the transistor is PD 1400 mW. The lamp's datasheet indicates it will draw 120 mA at its rated 15 V. Note the lamp doesn't obey Ohms law! The vi curve for the lamp is illustrated in the plot, and basically follows the formula iL = k(A-ULAMP) ULAMP, where k = 0.41 mA/V2, and A = 34.5 V, for ULAMP < 17.25 V. R₁ Si = = Vcc -0 B = iL (mA) 120 100 80 60 40 20 O N 4 Lamp v-i characteristic 6 8 VL (V) = 10 12 14 16
Transcribed Image Text:Design a lamp circuit in which a small control current switches a large lamp current. 15 V, B = 90 Use the transistor circuit below, in which Vcc (min), Vf 0.63 V, Vsat 0.25 V. The maximum power dissipation for the transistor is PD 1400 mW. The lamp's datasheet indicates it will draw 120 mA at its rated 15 V. Note the lamp doesn't obey Ohms law! The vi curve for the lamp is illustrated in the plot, and basically follows the formula iL = k(A-ULAMP) ULAMP, where k = 0.41 mA/V2, and A = 34.5 V, for ULAMP < 17.25 V. R₁ Si = = Vcc -0 B = iL (mA) 120 100 80 60 40 20 O N 4 Lamp v-i characteristic 6 8 VL (V) = 10 12 14 16
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