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AN2783 bảng dữ liệu(PDF) 16 Page - STMicroelectronics

tên linh kiện AN2783
Giải thích chi tiết về linh kiện  PM8800 demonstration kit for standard and high power PoE
PDF  47 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2783 bảng dữ liệu(HTML) 16 Page - STMicroelectronics

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Power-up sequence
AN2783
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6
Power-up sequence
It is recommended to apply power at the PoE input first, slowly increasing the voltage to
verify the absence of abnormal input current levels.
From 1.5 V to 11.5 V input, the signature phase, the PM8800 presents a 24.5 k
Ω nominal
resistor as load.
After that in the range 11.5 V to 23 V, the classification phase, the PM8800 draws about 1.5
mA plus the current fixed with the classification resistance, if mounted.
After those two steps are verified, the voltage can be increased to 48 V typical.
Two green LEDs indicate proper operation of the PoE and DC/DC section of the PM8800
demonstration kit. D15 is the nPGD LED and is on when the internal hot-swap MOSFET is
closed, while D11 indicates the presence of the output voltage.



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