TIDT407 October   2024

 

  1.   1
  2.   Description
  3.   Features
  4.   Applications
  5. 1Test Prerequisites
    1. 1.1 Voltage and Current Requirements
    2. 1.2 Required Equipment
    3. 1.3 Considerations
    4. 1.4 Dimensions
    5. 1.5 Test Setup
  6. 2Testing and Results
    1. 2.1 Efficiency Graphs
    2. 2.2 Efficiency Data
    3. 2.3 Thermal Images
  7. 3Waveforms
    1. 3.1 Charge Mode Start-Up Waveform
    2. 3.2 OTG Mode Start-Up Waveform
    3. 3.3 Voltage Transition at OTG Mode
    4. 3.4 Ripple and Noise at OTG Mode
    5. 3.5 Load Transients at OTG Mode
    6. 3.6 Switching Waveform
    7. 3.7 Overcurrent Protection at OTG Mode
    8. 3.8 Short-Circuit Protection
  8.   Trademarks

Description

This reference design is an integrated USB Type-C and USB power delivery (PD) charger for 10 to 12-cell batteries for applications such as e-bikes, high-capacity power banks, and portable power station applications.

The design incorporates USB PD3.1 controllers TPS26750 and TPD4S480, a 48V extended power range (ERP) USB port protector together with BQ25756, a four-switch buck boost controller to fully achieve USB PD3.1 function with 240W power capability. The PD controller works with the battery charger controller BQ25756 through I2C communication. BQ25756 supports a wide-range input with four-switch buck-boost configuration, and supports seamless transition from buck, boost, and buck-boost operation mode to provide a highly efficient, highly accurate, and reliable charger design. TPD4S480 provides 48V short-to-VBUS, overvoltage, and electrostatic discharge (ESD) protection that allow reliable and safe operation. The design achieved 97.6% full load efficiency.