MIKROE-957 mikroElektronika, MIKROE-957 Datasheet - Page 60

• 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

11.1 Brief theory and motivation
TPS7250 evaluation module helps us evaluate the operation and performance of
the TPS7250 family of linear regulators. The linear regulator TPS7250 from Texas
Instruments is capable of 200mA output current at 5V fixed output voltage level.
It is a low quiescent current, low noise, high PSRR, fast start-up LDO with excellent
line and transient response. See Figure 11.1 for the schematic diagram of the
evaluation module.
The input supply voltage VIN is fed at screw terminal CN3 and falls in the range
5.5V to 11V. The leads to the input supply must be as short as possible and must
be twisted to reduce EMI transmission. The capacitor C102 improves the transient
response of the regulator. The capacitor C101 helps to reduce the ringing on input
when supply wires are too long.
page 60
The ASLK Pro kit includes an on-board voltage regulator evaluation module
TPS7250. The goal of this experiment is to study the parameters of the
Low Dropout Regulator (LDO) IC TPS7250 from Texas Instruments using
the on-board evaluation module.
Goal of the experiment
4K7
R4
247K
LD4
R101
1
2
3
4
IC1
SENSE
SENSE
PG
PG
GND
GND
EN
EN
Figure 11.1: Schematic diagram of on-board evaluation module
OUT
OUT
OUT
OUT
OUT
IN
IN
IN
IN
8
7
6
5
C101
1u F
ENABLE
C103
10uF
C102
100nF
The regulator can be enabled/disabled using the
pin (EN) must never be left floating. Connecting a shorting jumper wire between pins
11.2 Specifications
To study the parameters (Line regulation, Load regulation) of LDO TPS7250 using the
on-board evaluation module.
11.3 Measurements to be taken
1 (GND) and pin 2 (EN) of JP7 enables the regulator. Connecting a jumper wire between
pins 2 (EN) and pin 3 (VIN) disables the regulator. Output voltage is available on screw
terminal CN4, or
1
2
IN
JP7
Obtain the Line Regulation: Vary the input voltage (from 5.5V to 11V in steps of
0.5V) and plot the output voltage as the function of the input voltage for a fixed
output load.
Obtain the Load Regulation: Vary the load (within the permissible limits) such that
load current varies and obtain the output voltage for a fixed input voltage. Plot
the output voltage as function of the load current.
OFF
ON
JP6
VCC+10
Vout
OUT
REG IN
pin header, and the typical load current is 200mA.
CN4
CN3
HD118
HD117
HD116
VOUT
GND
VIN
GND
VOUT
VIN
GND
Analog System Lab Kit PRO
ON/OFF
jumper JP7. The “Enable”