SLUUCD2A november   2020  – august 2023 TPS23731

 

  1.   1
  2.   TPS23731EVM-095 Evaluation Module
  3.   Trademarks
  4. 1Introduction
    1. 1.1 Features
    2. 1.2 Applications
  5. 2Electrical Specifications
  6. 3Description
  7. 4General Configuration and Description
    1. 4.1 Physical Access
  8. 5TPS23731EVM-095 Performance Data
    1. 5.1 Startup Response
    2. 5.2 Transient Response
    3. 5.3 Efficiency
    4. 5.4 Load Regulation
    5. 5.5 Hiccup Performance During an Output Short and Recovery
    6. 5.6 Bode Plots
  9. 6EVM Assembly Drawings and Layout Guidelines
    1. 6.1 PCB Drawings
    2. 6.2 Layout Guidelines
    3. 6.3 EMI Containment
  10. 7Schematic
  11. 8Bill of Materials
  12. 9Revision History

3 Description

The TPS23731VM-095 enables full evaluation of the TPS23731 device. Refer to the schematic shown in Figure 7-1 and Figure 7-2. Ethernet power is applied from J1 and is dropped to the bridge rectifier. The Power over Ethernet (PoE) transformer needed to transfer power or data is T1. The Bob Smith Terminations help balance the Ethernet cabled impedance and are critical for ESD and EMI or EMC performance. The EMI or EMC filter and transient protection for the TPS23731 device are at the output of the bridge rectifier.

Input power can also be applied at J3 from a DC source when power at J1 is not present.

The TPS23731 (U1) PD and DC-to-DC converter circuitry is shown in Figure 1. R28 provides the detection signature. The switched side of the PD controller is to the right of U1. The TPS23731 RTN pin(s) provides inrush limited turn on and charge of the bulk capacitor, C12.

The DC-to-DC converter is a high-efficiency primary side regulated synch flyback.

R34 provides a means for error injection to measure the frequency response of the converter.