Datasheet

2.2 Efficiency
60%
65%
70%
75%
80%
85%
90%
95%
100%
0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00
OutputCurrent(A)-I
O
Efficiency-%
V =25V
IN
V =34V
IN
V =41V
IN
Vout=3.3V
Test Setup and Results www.ti.com
Table 4. EVM Connectors and Test Points
Reference Function
Designator
J1 V
IN
(see Table 1 for V
IN
range)
J2 V
OUT
, 3.3 V at 0.5 A maximum
TP1 V
IN
test point at V
IN
connector
TP2 GND test point at V
IN
TP3 EN test point. Connect EN to ground to disable, open to enable.
TP4 Slow start monitor test point
TP5 PWRGD test point
TP6 PH test point
TP7 Output voltage test point at voltage divider. Used for loop response measurements.
TP8 Test point between voltage divider network and output. Used for loop response measurements.
TP9 Output voltage test point at OUT connector
TP10 GND test point at OUT connector
The efficiency of this EVM peaks at a load current of about 0.5 A - 1 A and then decreases as the load
current increases towards full load. Figure 1 shows the efficiency for the TPS54140EVM-429 at an
ambient temperature of 25 ° C.
Figure 1. TPS54140EVM-429 Efficiency
Figure 2 shows the efficiency for the TPS54140EVM-429 at lower output currents between 0.02 A and
0.25 A at an ambient temperature of 25 ° C.
4 TPS54140EVM-429 1.5-A, SWIFT™ Regulator Evaluation Module SLVU285 – March 2009
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