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UM1063 Datasheet(PDF) 24 Page - STMicroelectronics

Part # UM1063
Description  The PM8803 is a highly integrated device embedding
PDF  32 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

UM1063 Datasheet(HTML) 24 Page - STMicroelectronics

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DocID018573 Rev 2
Note, in this case, the presence of the 2-finger during the classification phase and theT2P
signal now asserted (T2P is valid low).
7.3.2
Transition from PoE to auxiliary and auxiliary to PoE
Figure 18 shows the behavior of the PM8803 when commuting sources. The image depicts
the transition from PoE to an auxiliary source whose voltage is ~10 V lower then PoE. It can
be seen that when the auxiliary voltage is applied (SA pin goes above its threshold) the
current drawn from the PoE drops to a few milliAmps. Smooth transition occurs as can be
seen from the output voltage (blue line).
Figure 18. Switching between PoE and auxiliary source



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