Regulators using Zener diode

1. Dr. P.H.Trivedi, SJASC, Bharuch, Paper V Semester 3

2.  It is very economic as it is of low cost.
 It requires only two or three components.
 It has a very simple circuit.
 It provides a better regulation over a wider
range of load currents and input voltages.
 It provide higher current capability.
Dr. P.H.Trivedi, SJASC, Bharuch, Paper V Semester 3

3.  It has poor efficiency for heavy loads because a
considerable amount of power is wasted in zener
resistance (R2) and series resistor (RS) in
comparison with load power.
 The DC output voltage slightly changes due to zener
resistance.
 Changes in load current produce changes in zener
current.
 Consequently the output voltage also changes.
 The internal impedance of the circuit is high.
 The voltage regulation is poor.
 The output voltage is not adjustable because it has
VO = VZ.
 It cannot be used for large load current.
Dr. P.H.Trivedi, SJASC, Bharuch, Paper V Semester 3