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AN2783 Datasheet(PDF) 16 Page - STMicroelectronics |
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AN2783 Datasheet(HTML) 16 Page - STMicroelectronics |
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16 / 47 page  Power-up sequence AN2783 16/47 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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