VRM10.1 XPhaseTM/DirectFETTM High Efficiency Demo Board ...
VRM10.1 XPhaseTM/DirectFETTM High Efficiency Demo Board ...
VRM10.1 XPhaseTM/DirectFETTM High Efficiency Demo Board ...
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XPhase TM /DirectFET TM <strong>VRM10.1</strong><br />
<strong>High</strong> <strong>Efficiency</strong> <strong>Demo</strong> <strong>Board</strong> (DB3C)<br />
Maximum power loss is slightly higher with reduced airflow, as can be seen in the next chart:<br />
Power loss vs. Load current at different airflow<br />
(VID=1.55V, ambient=27C)<br />
24.00<br />
22.00<br />
20.00<br />
18.00<br />
Loss at 300LFM<br />
Loss at 400LFM<br />
Loss at 500LFM<br />
16.00<br />
14.00<br />
12.00<br />
10.00<br />
8.00<br />
6.00<br />
0 20 40 60 80 100 120<br />
The maximum temperature rise (measure on the hottest phase IC) is a strong function of the<br />
airflow:<br />
70.0<br />
Delta-Temperature vs. Airflow<br />
(Load=120A, VID=1.55V)<br />
65.0<br />
60.0<br />
Load=120A, VID=1.55V<br />
Load=105A, VID=1.35V<br />
55.0<br />
50.0<br />
45.0<br />
40.0<br />
200 300 400 500 600<br />
Page 16 1/16/2004
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