CL21B104KBAC DATASHEET PDF

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For a single port, the system worst case power dissipation can be calculated as follows. Enables detection and powering of all Cisco devices including pre-standard terminals. In cases where the ambient temperature drops below C, or the product does not have to meet The Rsense in PD applications is only 1?

Each PD device handles one port. Direct driving of the LED circuitry. 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. Grounds There are several grounds used in the system: The PD can operate over a wide temperature range: The values are fixed for each mode of operation and described in the “R Mode pin” section in this document.

Stresses beyond those listed above may cause permanent damage to the device.

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The PD has a very low thermal dissipation. With a minimum of external components, the PD integrates in a one-port or two- port PoE-port switches and Midspans.

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Figure 1 shows the device with its related components for a 1-port configuration. No additional voltage sources e. The resulting voltage developed across both resistances is monitored to establish the Multi — point resistor detection?

It allows the user to choose a combination of three features, as specified in the following table: AC disconnect and DC disconnect function?

These levels are produced by switched resistor dividers and sensed by the PD in order to lc21b104kbac a valid PD connection.

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Exposure to absolute maximum rating conditions for extended periods may affect device reliability. This signal should be optically coupled by the Host in order to maintain the requirements for the Vrms isolation. The PD requires a single DC voltage source: The CAP option is pre standard Capacitor detection mode. Line Detection Circuitry — when performing a line detection procedure, the PoE device utilizes certain voltage levels over the output port.

Control A Reset control signal driven by the switch circuitry is used to reset the PoE circuit. Output port – The load resistance of the PD attached to the port is presented in parallel with R This PWM signal is filtered and utilized as the current limit circuitry voltage reference.

This power must be isolated from the switch supply and chassis by Vrms. Enables detection and powering of pre-standard power devices PDs. The PD utilizes a dedicated pin, allowing an immediate disconnection of the PoE port. Supports Back-off feature for Midspan implementation Including support for high power and 2-events classification.

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However, in order to reduce noise coupling, the grounds are physically separated and connected only at a single point.

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If an adequate 5V power source is available, the 5V regulation circuitry can be removed and the zener diodes may be replaced by lower current 5mA zener diodes but with same voltage requirements. The D15 and D16 should be selected for the application main voltage as follows: This disable-port datwsheet can be controlled via the Host CPU.

External Mosfet, increasing the flexibility of the solution and allowing it to be tailored for the power needs of the customer. It operates in a total stand-alone mode, with no need for user intervention. Visit our web site at: Classification Circuitry — After a port is investigated, the PD should be classified by a classification current signature.