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User's Guide
SLUUB11–April 2014
TPS23785BEVM-522 Evaluation Module
This user’s guide describes the TPS23785B evaluation module (TPS23785BEVM-522). TPS23785BEVM-
522 contains evaluation and reference circuitry for the TPS23785B. The TPS23785B device is an IEEE
802.3 compliant, powered-device (PD) controller and power supply controller optimized for non-isolated
converter topologies. TPS23785BEVM-522 is targeted at a high-efficiency 5.87-W PD solution.
Contents
1 Introduction ................................................................................................................... 2
2 Electrical Specifications..................................................................................................... 2
3 Description.................................................................................................................... 3
4 Schematic..................................................................................................................... 4
5 General Configuration and Description ................................................................................... 5
6 TPS23785BEVM-522 Performance Data................................................................................. 7
7 EVM Assembly Drawing and Layout Guidelines....................................................................... 10
8 Bill of Materials ............................................................................................................. 14
List of Figures
1 TPS23785BEVM-522 Schematic .......................................................................................... 4
2 Typical TPS23785BEVM-522 Test Setup ................................................................................ 6
3 Startup Response to Full Load for a 48-V Input......................................................................... 7
4 Transient Response of 5-V Output from 58 to 580 mA for a 48-V Input ............................................. 7
5 Transient Response of 3.3-V Output from 90 to 900 mA for a 48-V Input........................................... 8
6 Top Side Component Placement......................................................................................... 10
7 Top Side Routing........................................................................................................... 10
8 Layer 2 Routing............................................................................................................. 11
9 Layer 3 Routing............................................................................................................. 11
10 Bottom Side Routing....................................................................................................... 12
11 Bottom Component Placement........................................................................................... 12
List of Tables
1 TPS23785BEVM-522 Electrical and Performance Specifications at 25°C........................................... 2
2 Connector Functionality..................................................................................................... 5
3 Test Points.................................................................................................................... 5
4 Efficiency of the TPS23785BEVM-522.................................................................................... 9
5 TPS23785BEVM-522 BOM .............................................................................................. 14
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SLUUB11–April 2014 TPS23785BEVM-522 Evaluation Module
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