13-02-2013, 02:54 PM
ZENER DIODE CHARACTERISTICS AND AS VOLTAGE REGULATOR
ZENER DIODE.docx (Size: 185.61 KB / Downloads: 33)
Aim:
1.To experimentally obtain V-I characteristics of Zener diode (1N4730) and to find cutin voltage and breakdown voltage of the diode.
2. To design voltage regulator using Zener diode and find its regulation characteristics.
Selection of components and equipment ranges: -
• Note relevant manufacturer specifications of the device like Zener breakdown voltage VZ, Cutin voltage V, Maximum forward current IF, max, Maximum reverse current IZ, max, Knee current and voltage IZK, VZK, Threshold current and voltage IZT,VZT and power dissipation from data sheet. Identify terminals of the diode form diagram given in data sheet.
• Select range of variation of VS. i.e. VSmin, VSmax
• Criteria to select R should be to limit the current in the circuit to be less than IF, max when diode is forward biased and less than IZ, max when reverse biased. Find the value & wattage of the resistance.
One may use the relation:
R1 > (Vsmax – V)/IF, R2 > (Vsmax – VZ)/IZ
• Choose the component values close to the nearest standard values available in the laboratory.
• Select the range of ammeters and voltmeters.
• Test the device and components before soldering.