EE 2212

PROBLEM SET 6

S. G. Burns

Due:  Wednesday, 6 March 2013

 

1.       Your smart phone  requires 9.0 VDC regulated with a receive current of 5 mA and a transmit current of 200 mA. You want to use your car’s power port which has a nominal and lowest output voltage of 12 VDC although the voltage could go as high as 14.4 VDC when the engine and alternator are running.   Design an avalanche diode (Zener diode) voltage regulator that will allow you to operate your smart phone from the power port. Use the discussion and circuit diagram discussed in  class as well as Problem 4 on Problem Set 5 for guidance. (Of course you wouldn’t use your smart phone while you were driving!)

Your design should include:

(a)                   A well-labeled schematic diagram

(b)                   Key design equations

(c)                    Values including power ratings for any resistor(s) needed.

(d)                   Avalanche diode specifications that would work including VZ, IZ(min), IZ(max) and PZ.

 

2.      A power diode is rated at Imax  = 6 A and VJ = 0.7 volts.  The case temperature is not to exceed TC = 150°C.  The thermal resistance θJC = 4.25°C/W.

(a)      Estimate the junction temperature at maximum case temperature.

(b)      If the ambient temperature is TA = 30°C, what is the maximum thermal resistance, θCA, of the heat sink?

 

3.      Even though there are no assigned problems related to our discussions about photonic concepts and devices from 27 February and 1March, you should understand the content and interpretation of the information given in  posted WEB pages  SolarConstantInformation.docx SolarPanel1.JPG Poster.ppt

 

Note 1:           We will be starting Chapter 4 “Field-Effect Transistors” on Monday, 4 March.  Problems 4 and 5  are plug-and-chug to get you familiar with units and nomenclature.   

Note 2:           First observe that in lieu of specifications not explicitly stated in any given problem assigned in Chapter 4,  the general specifications in      Table   4.6 on page 204 are to be used. Other important numbers are also listed below Table 4.6.

 

 

4.      Text Problems 4.1 and  4.2 and for 4.2, observe that this is Cox, capacitance per unit area.  Watch your units.  Usually capacitance/cm2 are preferred for the area reference.  When the text and in the industry talks about an MOS capacitor, they are usually referring to capacitance/unit area.  The total capacitance can then be scaled by the W x L product.  The parallel plate basic capacitor model works well!

5.      Text 4.4 and 4.8 for NMOS and Text 4.48 for PMOS.  Organize your results in a table.

Recall the WOM (Write-Only-Memory) Signetics Data Sheet from the attachment to the diode experiment, Experiment 4.  I think those engineers may have taken a clue from some engineers at EIMAC.  The EIMAC division manufactures high power and specialty vacuum tubes used in high power transmitters and RF generators and related. This is a data sheet for the “PHANTASATRON”. EIMAC is now a subsidiary of Communications and Power Industries.  Enjoy!