Output Current (A)
E
ffi
ci
e
n
c
y
0
0.5
1
1.5
2
2.5
3
0
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
D001
PoE
Converter
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TPS2378EVM-602 Performance Data
9
SLVUAG7A – May 2015 – Revised July 2017
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TPS2378EVM-602 Evaluation Module
6.3
Efficiency
Figure 7
illustrates the efficiency of the TPS2378EVM-602.
Figure 7. Efficiency of the TPS2378EVM-602
6.4
Startup to Resistive Overload with TPS23861EVM-612
The IEEE802.3at standard requires the PD to startup with less than 13 W (per pair) for 80 ms during PSE
inrush. When using the TPS2378EVM-602 EVM with the TPS23861EVM-612 for evaluation while using
resistive loads, the output load must be light enough (< 1 A) at startup to meet this requirement. When the
output is operational, the load can be further increased to nominal 2.3A.
For startup to higher loads (> 1 A) the TPS2378EVM-602 contains an optional load delay circuit (shown in
Figure 3
) that delays connecting the resistive load while the PSE finishes inrush.
The load delay circuit is for evaluation only of the EVM using resistive loads. In final system PD designs, it
is the load’s task to accommodate the PSEs inrush time.
To disable the load delay circuit, shunt J11.
