VRM10.1 XPhaseTM/DirectFETTM High Efficiency Demo Board ...

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XPhase TM /DirectFET TM VRM10.1 High Efficiency Demo Board (DB3C) Maximum power loss is slightly higher with reduced airflow, as can be seen in the next chart: Power loss vs. Load current at different airflow (VID=1.55V, ambient=27C) 24.00 22.00 20.00 18.00 Loss at 300LFM Loss at 400LFM Loss at 500LFM 16.00 14.00 12.00 10.00 8.00 6.00 0 20 40 60 80 100 120 The maximum temperature rise (measure on the hottest phase IC) is a strong function of the airflow: 70.0 Delta-Temperature vs. Airflow (Load=120A, VID=1.55V) 65.0 60.0 Load=120A, VID=1.55V Load=105A, VID=1.35V 55.0 50.0 45.0 40.0 200 300 400 500 600 Page 16 1/16/2004
XPhase TM /DirectFET TM VRM10.1 High Efficiency Demo Board (DB3C) Startup Sequence When input voltage goes above 9.1V, SoftStart pin begins to charge up. When SoftStart pin charges to above 1.3V, the error amplifier output is released, which allows all PWMs to start switching. PowerGood signal is asserted when SS charges above 3.9V. Page 17 1/16/2004
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VRM10.1 XPhaseTM/DirectFETTM High Efficiency Demo Board ...

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