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PM8800ATR Datasheet(PDF) 20 Page - STMicroelectronics

No. de pieza PM8800ATR
Descripción Electrónicos  Integrated IEEE 802.3af compliant PoE-PD interface and PWM controller with support of external source
PDF  35 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

PM8800ATR Datasheet(HTML) 20 Page - STMicroelectronics

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PD interface
PM8800A
20/35
In the following picture a typical start sequence that can be observed in real circuits.
Figure 11.
Typical start up sequence
Ch1 = 5 Vout, Ch2 = VSS - GND, Ch3 = Vcc, Ch4 = I input
Depending on the application, care must be put on the choice of the inrush current limit to
avoid that the voltage drop on the external Ethernet cable will cause UVLO conditions during
the charging phase of the bulk capacitor.
It is recommended to select this voltage drop (20
Ω max for 100 m of cable x I inrush) to be
lower than the UVLO hysteresis ( 7 V) in order to avoid hiccup turn on.
5.5
Continuos current limitation
PM8800A provide a default continuos current limitation of 440 mA. This is achieved by
leaving the pin DCCDL floating. A different DC current limit can be set by connecting a
resistor between DCCL and VSS whose value can be obtained by the following equation:
R
DC kΩ
[]
11200
I
DC mA
[]
-----------------------
=



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