Texas Instruments TPS23755EVM-894 User Manual

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User's Guide
TPS23755EVM-894 Evaluation Module
This user's guide describes the TPS23755 evaluation module (EVM). The TPS23755 evaluation module
(TPS23755EVM-894) contains evaluation and reference circuitry for the TPS23755 device. The TPS23755
device is an IEEE 802.3at Type 1 compliant, powered-device (PD) controller and power supply controller
optimized for primary side regulation flyback converter topologies. TPS23755EVM-894 is targeted for a 12-V
diode-rectified high efficiency 13-W PD solution.
1 Introduction.............................................................................................................................................................................2
1.1 Features.............................................................................................................................................................................
1.2 Applications........................................................................................................................................................................2
2 Electrical Specifications........................................................................................................................................................
3 Description..............................................................................................................................................................................
4 Schematic................................................................................................................................................................................4
5 General Configuration and
5.1 Physical Access.................................................................................................................................................................
6 TPS23755EVM-894 Performance Data..................................................................................................................................
6.1 Startup to PSE and DCDC Startup....................................................................................................................................
6.2 Transient Response...........................................................................................................................................................
6.3 Efficiency............................................................................................................................................................................
6.4 Load Regulation.................................................................................................................................................................
6.5 Recovery from VOUT Short...............................................................................................................................................
6.6 Slew Rate Adjust................................................................................................................................................................9
7 EVM Assembly Drawings and Layout Guidelines.............................................................................................................
7.1 PCB Drawings..................................................................................................................................................................12
7.2 Layout Guidelines............................................................................................................................................................
7.3 EMI Containment.............................................................................................................................................................
8 Bill of Materials.....................................................................................................................................................................
Revision History.......................................................................................................................................................................23
Figure 4-1. TPS23755EVM-894
Figure 6-1. Startup Response When Connected to a PoE PSE (TPS23861) and DCDC Startup..............................................
Figure 6-2. Transient Response from 100 mA to 1 A for a 48-V
Figure 6-3. Efficiency of the TPS23755EVM-894........................................................................................................................
Figure 6-4. TPS23755EVM-894 Load Regulation.......................................................................................................................
Figure 6-5. DCDC Recovery From Output Short.........................................................................................................................
Figure 6-6. SRF = 0 Ω..................................................................................................................................................................9
Figure 6-7. SRF = 100 Ω............................................................................................................................................................10
Figure 6-8. SRR = 0 Ω...............................................................................................................................................................
Figure 6-9. SRR = 15 Ω.............................................................................................................................................................
Figure 7-1. Top-Side Component
Figure 7-2. Layer 2 Routing.......................................................................................................................................................
Figure 7-3. Layer 3 Routing.......................................................................................................................................................
Figure 7-4. Bottom-Side Routing...............................................................................................................................................
Table 2-1. TPS23755EVM-894 Electrical and Performance Specifications at
Table 5-1. Connector Functionality..............................................................................................................................................
SLVUBG8A - JULY 2018 - REVISED DECEMBER 2020
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ABSTRACT

Table of Contents

Description................................................................................................................................5
List of Figures
Schematic.................................................................................................................................4
Placement.............................................................................................................................12
List of Tables
Copyright © 2020 Texas Instruments Incorporated
Input.........................................................................................7
25°C....................................................................2
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