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ECE Department – ICA LAB Experiment No: 9
II/IV CSE & IT (I Semester)
Page 1 of 3
Three terminal voltage regulators using IC 7805 and 7912 Aim: To verify the three terminal terminal regulators using IC 7805 7805 and 7912. Apparatus: Voltage Regulator trainer kit 2. Oscilloscope 3. Digi Digita tall mult multim imet eter er 4. Connecting patch chords 1.
Circuit description: The IC 723 is a monolithic integrated circuit voltage regulator featuring high ripple rejection, excellent input and load regulation, excellent temperature stability etc., It cons consis ists ts of a temp temper erat atur ure e comp compen ensa sati ting ng refe refere renc nce e volt voltag age e ampl amplif ifie ier, r, an erro errorr ampl amplif ifie ier, r, 15 150m 0mA A outp output ut tran transi sist stor or and and an adjustable output current limiter. The basic low voltage regulator type 723 circuit is shown in fig (1). The unregulated input voltage is 24V and the regulated output voltage is from 0.2V to 7.3V by varying POTR. RSC (R1) is connected across current sense (CS) and current limit (CL) terminals to limit the accidental short circuit current. A stab stabil iliz izin ing g capa capaci cito torr (C1) (C1) of 10 100 0 pF is conn connec ecte ted d betw betwee een n freque frequency ncy compen compensat sation ion termin terminal al and invert inverting ing (INV) (INV) termin terminal. al. External NPN pass transistor is added to the basic 723-regulator circuit to increase its load current capability. The output voltage can be regulated from 7 to 37 Volts for an input voltage range from 9.5 to 40Volts. For intermediate output voltages the following formula can be used V out =
R1′ + R2′ R2
XV ref
The resistor values R1′ & R2′ are calcul calculate ated d from from potent potential ial divide dividerr network® .
ECE Department – ICA LAB Experiment No: 9
II/IV CSE & IT (I Semester)
Page 2 of 3
Procedure: Connect the circuit diagram as shown in figure. 2. Meas Measur ure e the the outp output ut of the the regu regula late ted d powe powerr su supp pply ly that is 0 to +40 and 0 to -40 V using digital multimeter.
1.
Fixed voltage regulators 7805 (+5 V) 3. Con Connect nect the cir circuit cuit as sh show own n in fig figure ure to obser serve the the line line regulation.
4. By varying varying Vin supply supply in steps measure measure the correspo corresponding nding output output Vo and record in a tabulated form as shown below.
5. Plot the graph graph between between Vin, Vin, Vo and observe observe the the line regulatio regulation. n.
6. Connect Connect the circuit circuit as shown shown in below below figure figure for line regulat regulation. ion. 7. Repe Repeat at ste steps ps 4 and and 5. 5.
