data sheet

TPS2375

TPS2376

TPS2377

RTN: This pin provides the switched negative power rail used by the downstream circuits. The operational and

inrush current limit control current into the pin. The PG circuit monitors the RTN voltage and also uses it as the

return for the PG pin pulldown transistor. The internal MOSFET body diode clamps VSS to RTN when voltage is

present between VDD and RTN and the PoE input is not present.

PG: This pin goes to a high resistance state when the internal MOSFET that feeds the RTN pin is enabled, and

the device is not in inrush current limiting. In all other states except detection, the PG output is pulled to RTN by

the internal open-drain transistor. Performance is assured with at least 4 V between VDD and RTN.

PG is an open-drain output; therefore, it may require a pullup resistor or other interface.

UVLO: This pin is specific to the TPS2376; it is not internally connected on the TPS2375 and TPS2377. The

UVLO pin is used with an external resistor divider between VDD and VSS to set the upper and lower UVLO

thresholds. The hysteresis, as measured as a percentage of the upper UVLO, is the same as the TPS2375.

VDD sags due to cable resistance and the dynamic resistance of the input diodes. The lower UVLO threshold

must be below the lowest voltage that the input reaches.

The TPS2376 implements adjustable UVLO thresholds, but is otherwise functionally equivalent to the TPS2375.

The TPS2375 offers fixed UVLO thresholds designed to maximize hysteresis while maintaining compatibility with

the IEEE 802.3af standard. The TPS2377 offers fixed UVLO thresholds optimized for use with legacy PoE

systems.

VDD: This is the positive input supply to the TPS2375, which is also common to downstream load circuits. This

pin provides operating power and allows the controller to monitor the line voltage to determine the mode of

operation.

Copyright © 2004–2008, Texas Instruments Incorporated

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Product Folder Link(s): TPS2375 TPS2376 TPS2377