SLVSGM2 March   2023 TPS548C26

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1  Internal VCC LDO and Using an External Bias on VCC and VDRV Pin
      2. 7.3.2  Input Undervoltage Lockout (UVLO)
        1. 7.3.2.1 Fixed VCC_OK UVLO
        2. 7.3.2.2 Fixed VDRV UVLO
        3. 7.3.2.3 Fixed PVIN UVLO
        4. 7.3.2.4 Enable
      3. 7.3.3  Set the Output Voltage
      4. 7.3.4  Differential Remote Sense and Feedback Divider
      5. 7.3.5  Start-up and Shutdown
      6. 7.3.6  Loop Compensation
      7. 7.3.7  Set Switching Frequency and Operation Mode
      8. 7.3.8  Switching Node (SW)
      9. 7.3.9  Overcurrent Limit and Low-side Current Sense
      10. 7.3.10 Negative Overcurrent Limit
      11. 7.3.11 Zero-Crossing Detection
      12. 7.3.12 Input Overvoltage Protection
      13. 7.3.13 Output Undervoltage and Overvoltage Protection
      14. 7.3.14 Overtemperature Protection
      15. 7.3.15 Power Good
    4. 7.4 Device Functional Modes
      1. 7.4.1 Forced Continuous-Conduction Mode
      2. 7.4.2 Auto-Skip Eco-mode Light Load Operation
      3. 7.4.3 Powering the Device from a 12-V Bus
      4. 7.4.4 Powering the Device From a Split-rail Configuration
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Application
      2. 8.2.2 Design Requirements
      3. 8.2.3 Detailed Design Procedure
        1. 8.2.3.1 Inductor Selection
        2. 8.2.3.2 Input Capacitor Selection
        3. 8.2.3.3 Output Capacitor Selection
        4. 8.2.3.4 VCC and VRDV Bypass Capacitor
        5. 8.2.3.5 BOOT Capacitor Selection
        6. 8.2.3.6 PG Pullup Resistor Selection
      4. 8.2.4 Application Curves
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Layout Example
        1. 8.4.2.1 Thermal Performance on TPS548C26 Evaluation Board
  9. 9 Device and Documentation Support
    1. 9.1 Receiving Notification of Documentation Updates
    2. 9.2 Support Resources
    3. 9.3 Trademarks
    4. 9.4 Electrostatic Discharge Caution
    5. 9.5 Glossary
  10. 10Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

7.3.4 Differential Remote Sense and Feedback Divider

The TPS548C26 device offers true differential remote sense function which is implemented between FB pin and GOSNS pin. The output of the differential remote sense amplifier is internally fed into the control loop and does not come out to a package pin.

Differential remote sense function compensates a potential voltage drop on the PCB traces thus helps maintain VOUT accuracy under steady state operation and load transient event. Connecting the FB voltage divider resistors to the remote location allows sensing the output voltage at a remote location. The connections from FB voltage divider resistors to the remote location must be a pair of PCB traces with at least 12 mil trace width, and must implement Kelvin sensing across a high bypass capacitor of 0.1 μF or higher on the sensing location. The ground connection of the remote sensing signal must be connected to the GOSNS pin. The VOUT connection of the remote sensing signal must be connected to the VOSNS pin and the top feedback resistor RFB_top. To maintain stable output voltage and minimize the ripple, the pair of remote sensing lines must stay away from any noise sources such as inductor and SW node, or high frequency clock lines. TI recommends to shield the pair of remote sensing lines with ground planes above and below.

The recommended GOSNS operating range (refer to AGND pin) is −100 mV to +100 mV. In case of local sense (no remote sensing), short GOSNS pin to AGND.