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CL21B104KBAC DATASHEET PDF

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With a minimum of external components, the PD integrates in a one-port or two- port PoE-port switches and Midspans.

It operates in a total stand-alone mode, with no need for user intervention.

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Multi — point resistor detection? AC disconnect and DC disconnect function? Supports Back-off feature for Midspan implementation Including support for high power and 2-events classification. The PD requires a single DC voltage source: No additional voltage sources e. The PD can operate over daatasheet wide temperature range: The PD has dwtasheet very low daasheet dissipation.

The Rsense in PD applications is only 1? External Mosfet, increasing the flexibility of the solution and allowing it to be tailored for the power needs of the customer. The PD utilizes a dedicated pin, allowing an immediate disconnection of the PoE port. This disable-port pin can be controlled via the Host CPU. Enables detection and powering of pre-standard power devices PDs.

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Enables detection and powering of all Cisco devices including pre-standard terminals. Direct driving of the LED circuitry. Stresses beyond those listed above may cause permanent damage to the device. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. For a co21b104kbac port, the system worst case power dissipation can be calculated as follows.

The CAP option is pre standard Capacitor detection mode. Control A Reset control signal driven by the switch circuitry is used to reset the PoE circuit. This signal should be optically coupled by the Host in order to maintain the requirements for the Vrms isolation. This power must be isolated from the switch supply and chassis by Vrms.

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Grounds There are several grounds used in the system: This ground plane should be Vrms isolated from the PoE circuitry as well as the power supply for the PoE circuitry. The digital and analog grounds are electrically the same ground. However, in order to reduce noise coupling, the grounds are physically separated and connected only at a single point. The D15 and D16 should be selected for the application main voltage as follows: If an adequate 5V datasheeet source is available, the 5V regulation circuitry can be removed and the zener diodes dtasheet be replaced by lower current 5mA zener diodes but with same voltage requirements.

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It allows the user to choose a combination of three features, as specified in the following table: Datasjeet PD device handles one port. Figure 1 shows the device with its related components for a 1-port configuration. The values are fixed for each mode of operation and described datahseet the “R Mode pin” section in this document. Line Detection Circuitry — when performing a line detection procedure, the PoE device utilizes certain voltage levels over the output port.

These levels are produced by switched resistor dividers and sensed by the PD in order to confirm datassheet valid PD connection. This PWM signal is filtered and utilized as the current limit circuitry voltage reference. In cases where the ambient temperature drops below C, or the product datashheet not have to meet Classification Circuitry — After a port is investigated, the PD should be classified by a classification current signature.

Output port – The load resistance of the PD attached to the port is presented in parallel with R The resulting voltage developed across both resistances is monitored to establish the Visit our web site at: