TPS23750EVM-108: POE 3.3V @ 3A, 36 ~ 57Vin

Summary

The HPA108 evaluation module implements an IEEE 802.3af-compliant class-3 power interface and a DC/DC switching converter using the Texas Instruments TPS23750 powered device (PD) controller in a typical Power-over-Ethernet (PoE) configuration.

The DC/DC converter provided on this EVM is a 3.3-V isolated design using a synchronous flyback topology; however, the BOM shows how to build 3.3-V or 5-V isolated and non-isolated variants. In addition, the EVM provides footprints for a simple diode and an associated snubber to implement a nonsynchronous flyback converter. A small prototype area is included on the printed-circuit board. The EVM accepts a TPS23770 in place of the TPS23750 to support a PD with a legacy undervoltage lockout (UVLO) threshold.

The EVM has separate LEDs that show when the DC/DC converter and the PoE interface are active. Test points are provided at all critical nodes. Power to the EVM is provided over the spare or data lines in an Ethernet cable or by an auxiliary source like a wall adapter.

Specifications

Manufacturer	Texas Instruments
Category	Power Management
Sub-Category	POE - Power Over Ethernet
Eval Board Part Number	296-21147-ND
Eval Board Supplier	Texas Instruments
Eval Board	Normally In Stock
Compliance	IEEE 802.3af (802.3at Type 1)
Outputs and Type	1 Isolated
Voltage Out	3.3 V
Current Out	3 A
Voltage In	36 ~ 57 V
Efficiency @ Conditions	>78%, 44V in, 3.3V @ 1.25 ~ 3 A >70%, 44V in, 5V @ 0.5 ~ 2 A
Internal Switch	No
Features	Thermal Protection Under Voltage Protection, Brown-Out
Switching Frequency	200 kHz
Component Count + Extras	63 + 22
Application / Target Market	Telecom
Design Author	Texas Instruments
Main I.C. Base Part	TPS23750
Date Created By Author
Date Added To Library	2011-03