SLUUCB6A June   2020  – August 2022 TPS23734

 

  1.   TPS23734EVM-094 Evaluation Module
  2.   Trademarks
  3. 1Introduction
    1. 1.1 Features
    2. 1.2 Applications
  4. 2Electrical Specifications
  5. 3Description
  6. 4Schematic and Bill of Materials
  7. 5General Configuration and Description
    1. 5.1 Physical Access
  8. 6TPS23734EVM-094 Performance Data
    1. 6.1 Startup to PSE and DC/DC Startup
    2. 6.2 Transient Response
    3. 6.3 Efficiency
    4. 6.4 Load Regulation
    5. 6.5 Hiccup Performance During an Output Short and Recovery
    6. 6.6 Bode Plots
  9. 7EVM Assembly Drawings and Layout Guidelines
    1. 7.1 PCB Drawings
    2. 7.2 Layout Guidelines
    3. 7.3 EMI Containment
  10. 8Bill of Materials
  11. 9Revision History

3 Description

The TPS23734VM-094 enables full evaluation of the TPS23734 device. Refer to the schematic shown in Figure 4-1 and Figure 4-2. Ethernet power is applied from J2 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 TPS23734 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 TPS23734 (U1) PD and DC-to-DC converter circuitry is shown in Figure 1. R36 provides the detection signature. The switched side of the PD controller is to the right of U1. The TPS23734 RTN pins provide inrush limited turn-on and charge of the bulk capacitor, C19.

The DC-to-DC converter is a high-efficiency active clamp forward converter.

R43 provides a means for error injection to measure the frequency response of the converter.