A community for students.
Here's the question you clicked on:
 0 viewing
Qaisersatti
 3 years ago
HW12 QNo 2 Part 3 4 5 and r any help please
Qaisersatti
 3 years ago
HW12 QNo 2 Part 3 4 5 and r any help please

This Question is Closed

Qaisersatti
 3 years ago
Best ResponseYou've already chosen the best response.0@theyatin H12P2 LINEAR REGULATOR **NOTE: Due to how these answer fields depend on each other, "H12P2 Linear Regulator" requires all 6 fields to contain answers for the "check" button to work. This means that writing the correct answer in the first two fields can yield a red X if the last part of the problem has not yet been answered. Also, as the last part of this problem is a design problem, the final four responses are related to each other; hence all four responses entered must agree with each other in order to receive a checkmark.** A linear regulator is a widely used electronic device that maintains a constant output voltage regardless of the value of input voltage (as long as it is larger than a certain threshold). The typical schematic for a regulator is the following: The Bipolar Junction Transistor (BJT) is a device that can be modeled with a current controlled dependent sourve and a diode; the gain K depends on the specific BJT being used. For our analysis we will use that model, and therefore the circuit is: The Zener diode, as we studied before, has the following IV characteristic: As part of your job as an engineer, your company has asked you to design a new regulator. Before actually doing the design, let's do some calculations. For your results you may consider the BJT, diode and the amplifier to be ideal (A→∞, Zin→∞, Zout=0). (a) Write an expression for the output voltage (vout) when the input voltage is below the Zener voltage (vin<vz). The answer should only be a function of resistances and input voltage. correct vin⋅R1+R2R2 (b) Consider the case when input voltage is above the Zener voltage vin>vz and, for now, assume Rz=0. Write an expression for the output voltage as a function of vz and resistances. correct vz⋅R1+R2R2 Now we are ready for the actual design. The goal of your project is to select the appropriate resistances so that the output voltage is 5V±0.1V when the input voltage varies between 10V and 20V. Assume that the Zener diode you are using has a vz=2.5V and Rz=1Ω (Notice Rz is not zero anymore!). (c) What combination of R0, R1 and R2 satisfies the output voltage requirement? incorrect incorrect incorrect (d) What is the minimum efficiency of your regulator if we consider a BJT with K=0.95 and a resistance of RL=100Ω is connected at the output terminal? (Hint: Notice that there are two power inputs to the circuit: the input terminal and the amplifier.)

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0sorry brother i don't have practical knowledge of apparatuses. ..

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0http://openstudy.com/study#/updates/50ade35ce4b09749ccabd499

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0Answer to HW12 P2 , c and d c)700 500 500 d) 0.15 put all four and check
Ask your own question
Sign UpFind more explanations on OpenStudy
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.