Datasheet

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3.1.2 J2 – Ethernet Power
3.1.3 J3 – DC/DC Input Power
3.1.4 J4 – 5V Output Power
3.1.5 J5 – Powered-Device DC/DC Disconnect
3.2 Electrical Specifications
Setup
J2 is the RJ-45 adapter jack for connecting Ethernet Power to the evaluation board. Plug in the CAT5
cable from the PSE here to deliver power to the board. Only apply power to either J3 or J4 at one time;
never apply power at both J3 and J4 at the same time. When applying power at J2, place the shorting
jumper on J5 for proper operation.
In some cases it is beneficial to test the DC/DC power supply without using the front-end PD. J3 is the
power connector used when testing the DC/DC power supply without the front-end PD functionality. Apply
+48 V to the TP1 side of the header, and connect the return GND path to the TP2 side. Only apply power
to either J3 or J4 at one time; never apply power at both J3 and J4 at the same time. While applying
power at J3, remove the shorting jumper on J5 to ensure proper functionality.
J4 is the 5-V output of the DC/DC power supply. Connect a load between the two terminals of this header.
The positive polarity is closest to TP5, and the negative polarity is closest to TP9.
This jumper connects the PG output of the TPS2376-H to the timing capacitor of the UCC3809-2. Holding
this node low disables the UCC3809-2 and prevents the 5-V output from turning on. When applying power
at J2 and testing the PD functionality of this board, place the shorting jumper on J5 so that the power
supply is disabled until the PG signal of the TPS2376-H is released. When applying power at J3 and
testing only the DC/DC power supply without PD functionality, remove this shorting jumper.
PARAMETER CONDITION MIN TYP MAX UNIT
POWER INTERFACE
Input voltage, V
IN
Applied to the power pins of connectors J2 or J3 0 57 V
Operating voltage After startup 41 57 V
Rising input voltage 40.5 V
Input UVLO
Falling input voltage 29 V
Detection voltage 1.4 10.1 V
Classification voltage 10.2 23 V
Classification current 2.2 2.4 2.8 mA
DC/DC CONVERTER
Output voltage 41 V < V
IN
< 57 V, Up to full load 4.75 5 5.25 V
Output current 41 V < V
IN
< 57 V 5 A
Output ripple voltage, peak-to-peak V
IN
= 48 V, Load = 5 A 50 mV
Efficiency, end-to-end V
IN
= 48 V, Load = 3 A 83%
Switching frequency 270 330 kHz
SLVU197B – March 2007 – Revised September 2007 TPS2376HEVM 3
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