MIKROE-957 mikroElektronika, MIKROE-957 Datasheet - Page 65

• Manufacturer Part Number: MIKROE-957
• Description: Other Development Tools ASLK PRO ANALOG DEVELOPMENT SYSTEM
• Manufacturer: mikroElektronika

Specifications of MIKROE-957

• Rohs: yes
• Product: Analog System Lab Kit PRO
• Tool Is For Evaluation Of: TL082, MPY634
• Operating Supply Voltage: 2.5 V to 5.5 V
• Description/function: Analog Lab Kit for Undergraduate Engineering
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C

What should be the value of the external
resistance for the regulated output of 5V?
The unregulated input is connected at screw terminal CN5. Output load is connected
to screw terminal at CN6.The switching waveform can be observed at the terminal
TP4.The evaluation module has a switching frequency of 200 kHz. This frequency
is decided by the combination of R201 and C213. The duty cycle of this waveform
varies linearly with the input voltage for a constant output voltage, as shown
below.
The output ripple voltage can be measured across terminals TP5 and TP7 by simply
placing the oscilloscope probes. The oscilloscope must be set for
AC coupling. The same terminals can be used for the measurement of the regulated
output DC voltage using a voltmeter.
12.2 Specifications
In this experiment, we wish to study the line and load regulation for the TPS40200
integrated circuit when it is configured to generate a 5V DC output.
12.3 Measurements to be taken
Configure the on board evaluation module to generate constant 5V DC output by
making the changes in the feedback path using the available terminals.
1
2
Analog System Lab Kit PRO
Obtain the Line Regulation: Vary the input voltage from 10V to 15V in steps
of 0.5V and plot the output voltage as the function of the input voltage for a
constant output load.
Obtain the Load Regulation: Vary the load (within the permissible limits) such
that load current varies and obtain the output voltage for constant input
voltage. Plot the output voltage as a function of the load current.
1
V
V
V
TP
TP
TP
TP
TP
C
b
R
J
R
M
out
ref
out
201
209
201
213
=
205
207
20
203
204
X
=
=
=
8
R
0.7
V duty cycle
V
209
b
in
ref
R
$
+
V
209
R
207
1
V
V
b
V
TP
TP
R
TP
J
TP
TP
R
C
out
ref
out
M
201
209
201
213
=
205
207
20
203
204
X
=
=
=
8
R
impedance,
0.7
V duty cycle
V
209
b
in
ref
R
$
V
+
209
R
207
12.4 What should you submit?
1
2
TP3
TP4
Vin
Vout
3
4
-10.00
20.00
10.00
10.00
What should be the value of the external resistance to be connected between
TP8 and Ground to configure the evaluation module to generate regulated
output voltage of 5V?
Simulate the configured circuit using a simulator. The typical waveforms will
be of the form shown in Figure 12.2.
1.00
0.00
5.01
4.98
Configure the on board evaluation module to generate a regulated output
voltage of 5V, and observe the waveforms mentioned in Figure 12.2 and
compare with the simulation results.
Vary the input voltage for a regulated output voltage of 5V and observe the
change in the duty cycle of the PWM waveform. Use Table 12.1 to record the
readings. Compare the readings with simulation results and plot the graph
between the input voltage and duty cycle. Is the plot linear?
Figure 12.2: Simulation waveforms - TP3 is the PWM waveform
10.00m
and TP4 is the switching waveform
10.02m
10.05m
10.07m
page 65
10.10m