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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PM8801 датащи(PDF) 25 Page - STMicroelectronics |
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PM8801 датащи(HTML) 25 Page - STMicroelectronics |
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25 / 37 page  DocID018560 Rev 2 25/37 PM8801 PD interface To minimize current consumption during sleep mode, the MPS current is obtained by: – the 12 mA driving LED current when the LED is on – an internal 12 mA sink when the LED is off This behavior ensures a 12 mA constant MPS current shape when the MPS is on. During MPS dropout the consumption is due only to the quiescent current and the average LED driving current. IMPDO= Iddq + D*ILED Figure 11. LED enabled at startup Ch1: LED, Ch2: ENDC, Ch3: Iinput, Ch4: 5Vout LED signal will be present also in the case an auxiliary source is used in place of PoE. If both PoE and auxiliary source are connected, the PoE interface is not providing power to the DC/DC section, but still provides current to the LED. When working from an auxiliary source, if the system requires disconnection from the PSE, it is suggested to turn off the LED for at least 400 msec after insertion of the auxiliary power jack. |
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