ECE2201 Lectures Bitar

Lecture 7 – Diode Applications

(Tue before Lab2)

Lab1 Report Questions (see webpage): (1) Extracting IS and n from data. (2) Plotting the diode curve on Semi-Log paper. (3) Piece-wise Linear Model (VD0. rD) Lab2 Prelab Q’s: (1) Zener Diode Regulator Lecture

o Half-Wave Circuit Review o Defining and Deriving Ripple Voltage o Ripple Voltage Equation (Approximation)

Lab2 Review

o Full-Wave Rectifier (w/ center-tapped transformer) o Voltage Regulation (Zener) o Voltage Regulator (LM7805)

Plotting the Diode V-I Characteristic

Is (A) 1.00E-13n 1

Vt (V) 0.026

VD ID(A)0.00 1.00E-130.02 2.16E-130.04 4.66E-130.06 1.01E-120.08 2.17E-120.10 4.68E-120.12 1.01E-110.14 2.18E-110.16 4.71E-110.18 1.02E-100.20 2.19E-100.22 4.73E-100.24 1.02E-090.26 2.20E-090.28 4.75E-090.30 1.03E-080.32 2.21E-080.34 4.78E-080.36 1.03E-070.38 2.23E-070.40 4.80E-070.42 1.04E-060.44 2.24E-060.46 4.83E-060.48 1.04E-050.50 2.25E-050.52 4.85E-050.54 1.05E-040.56 2.26E-040.58 4.88E-040.60 0.001050.62 0.002270.64 0.004900.66 0.010580.68 0.022830.70 0.049270.72 0.106320.73 0.156190.74 0.229450.75 0.337070.76 0.495180.77 0.727440.78 1.068650.79 1.569900.80 2.30625

Diode V-I Characteristic

0.000

0.500

1.000

1.500

2.000

2.500

0.00 0.20 0.40 0.60 0.80 1.00

Diode Voltage (V)

Dio

de C

urre

nt (A

)

Diode V-I Characteristic

1.0E-14

1.0E-12

1.0E-10

1.0E-08

1.0E-06

1.0E-04

1.0E-02

1.0E+00

1.0E+02

0.00 0.10 0.20 0.30 0.40 0.50 0.60 0.70 0.80 0.90

Diode Voltage (V)

Dio

de C

urre

nt (A

)