MIKROE-957 mikroElektronika, MIKROE-957 Datasheet - Page 64

• 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

12.1 Brief theory and motivation
The TPS40200 evaluation module included on ASLK PRO. Kit uses the TPS40200
non synchronous buck converter to provide a resistor-selected, 3.3V or 5V output that
delivers up to 2.5A from up to 16V input bus. See Figure 12-1 for a schematic diagram
of the EVM. The evaluation module operates from a single supply and uses the single
page 64
The goal of the experiment is to configure the on-board evaluation module
TPS40200 on the ASLK PRO Kit as a switched mode power supply that
can provide a regulated output voltage of 5V or 3.3V for an input whose
range is 6V-15V.
CN5
VIN
HD142
Vin
Goal of the experiment
DC/DC IN
VCC+10
C207
33pF
JP9
HD120
TP2
VIN
R 205
100K
C206
4.7nF
470pF
C201
220uF
C213
R201
100K
R210
1M
470nF
C214
JP8
3.3V
5V
TP1
HD122
TP3
HD121
R211
41K2
RC
SS
COMP
C203
220nF
1
2
3
4
U4
R209
27K4
RC
RC
SS
SS
COMP
COMP
FB
FB
Figure 12.1: Schematic of the on-board EVM
ISNS
ISNS
R207
100K
VDD
VDD
DRV
GND
GND
DRV
C204
220nF
8
7
6
5
ISNS
DRV
TP8
HD123
C208
100nF
C205
470pF
R204
0E
R208
49.9
TP6
HD124
GATE
P–channel Power FET and Schottky diode to produce a low cost buck converter. The
regulated output of the EVM is resistance-selected and can be adjusted within the
limited range by making the changes in the feedback loop, as shown below.
The feedback factor
adjust the output. But in ASLK PRO, we do not have the provision of changing R209.
We can therefore achieve this task by connecting an external resistance of suitable
value between the terminals TP8 and the ground.
R203
1K
TP9
HD125
3
D201
MBRS340
TP4
HD126
R202
0.03
Q101
FDC5614P
R 206
25.5E
C202
68pF
L201
33uH
1
C
V
V
b
V
TP
TP
R
TP
J
TP
TP
R
M
out
ref
out
201
TP7
HD127
209
201
213
=
205
207
20
203
204
can be changed by changing feedback resistance R209 to
X
=
=
=
8
R
0.7
V duty cycle
V
209
b
in
ref
R
C209
330uF
$
+
V
1
C
V
V
V
209
TP
TP
R
TP
TP
TP
R
b
J
M
out
ref
out
R
201
213
209
201
TP5
HD128
207
=
205
207
20
203
204
X
C210
330uF
=
=
=
8
VOUT
R
0.7
V duty cycle
V
209
b
in
ref
C211
10uF
R
$
+
V
209
Analog System Lab Kit PRO
R
C212
10uF
207
R3
4K7
LD3
HD143
CN6
VOUT
VOUT