SLUAAV6 September   2024 TPS56837 , TPS56837H

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
    1. 1.1 USB Type-C Power Delivery Introduction
    2. 1.2 TPS56837HA Introduction
    3. 1.3 Block Diagram of TPS56837HA in USB Type-C Power Delivery Application
  5. 2PD Controller GPIO to Configure TPS56837HA Dynamically Output Change
    1. 2.1 Typical Application
    2. 2.2 Test Results
      1. 2.2.1 Dynamically Change Waveforms
      2. 2.2.2 Efficiency Curves
      3. 2.2.3 Thermal Pictures
  6. 3PD Controller Dedicated FB Pin to Control TPS56837HA Dynamic Output Change
    1. 3.1 FB Current Injection PD Controller
    2. 3.2 Rfb Integrated PD Controller
  7. 4Summary
  8. 5References

3.1 FB Current Injection PD Controller

Figure 3-1 shows PD controller injects current to FB-pin to configure TPS56837HA output voltage. The PD_OUT and PD_FB port are directly connected to PD controller pins. According to Kirchhoff's Current Law (KCL), the output voltage Vout can be derived from Equation 1, where Vfb is 0.6V.
PD controller FB Current Injection for TPS56837HA Dynamically Output Change Reference Schematic Figure 3-1 PD controller FB Current Injection for TPS56837HA Dynamically Output Change Reference Schematic
Equation 1. V o u t - V f b R 6 + V P F _ F B - V f b R 8 = V f b R 7