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PM8800ATR Datasheet(PDF) 31 Page - STMicroelectronics

Part # PM8800ATR
Description  Integrated IEEE 802.3af compliant PoE-PD interface and PWM controller with support of external source
PDF  35 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

PM8800ATR Datasheet(HTML) 31 Page - STMicroelectronics

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PM8800A
Auxiliary sources
31/35
If the current forced into AUXII pin is lower than 60
µA, the internal under voltage lock out
threshold will be lowered but AUXII connection will be not prevalent to the PoE; in this case
power to the DC/DC converter will be drawn from the source that has been applied first.
In case of very low auxiliary voltage (i.e. lower than 15 V) is recommended to supply VCC
directly with the auxiliary voltage through a bypass diode, in order to assure a proper
operation of the pwm section of PM8800A.
Figure 20.
Switch over between 48 V PoE and 12 V AUXII auxiliary adapter
Ch1 = 5 Vout, Ch2 = Aux voltage, Ch3 = internal primary voltage, Ch4 = Aux input current
Ch3
Ch2



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