80
85
90
95
100
0
2
4
6
8
E
F
F
ICI
E
NC
Y
[%
]
LOAD CURRENT [A]
C001
F
SW
= 250 kHz
V
OUT
= 28V
V
SUPPPLY
= 20V
V
SUPPLY
= 9V
V
SUPPLY
= 12V
Performance Curves
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5.2
Test Setup
5.2.1
Power Supply
Connect the power supply’s positive terminal (+) to ‘A’ terminal of ampere meter and negative terminal (-)
to TP4 GND. Connect the power supply’s positive remote sense terminal to TP2 VIN and negative remote
sense terminal to TP4 GND.
5.2.2
Meter
Connect ‘COM’ terminal of ampere meter to TP2 VIN. Double check ‘A’ terminal is connected to the power
supply’s positive terminal.
Voltage meter is used to measure output voltage. Connect positive terminal (V) of the voltage meter to
TP1 VOUT and negative terminal (COM) of the voltage meter to TP3 GND.
5.2.3
Load
Connect electronic load’s positive terminal (+) to TP1 VOUT and negative terminal (-) to TP3 GND.
5.3
Quick Test Procedure
5.3.1
Startup
•
Set load current to 0 A and turn the load on
•
Set power supply current limit to 25 A
•
Turn on the power supply and increase voltage slowly up to 20 V
•
Increase load current slowly up to 7 A
5.3.2
Shutdown
•
Turn off the load
•
Decrease the input voltage down to 0 V
•
Turn on the load and discharge output capacitor
6
Performance Curves
The following curves are presented for reference, the actual field data may differ from these curves. Actual
performance data can be affected by measurement techniques, equipment setting and environmental
variables.
6.1
Efficiency
Figure 2. Efficiency
6
LM5122EVM-2PH Evaluation Module
SNVU205 – APRIL 2013
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