SNVSCB9A march   2023  – april 2023 TPSF12C1

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Device Comparison Table
  6. 6 Pin Configuration and Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 System Characteristics
    7. 7.7 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Active EMI Filtering
        1. 8.3.1.1 Schematics
      2. 8.3.2 Capacitive Amplification
      3. 8.3.3 Integrated Line Rejection Filter
      4. 8.3.4 Compensation
      5. 8.3.5 Remote Enable
      6. 8.3.6 Supply Voltage UVLO Protection
      7. 8.3.7 Thermal Shutdown Protection
    4. 8.4 Device Functional Modes
      1. 8.4.1 Shutdown Mode
      2. 8.4.2 Active Mode
  9. 9 Applications and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Applications
      1. 9.2.1 Design 1 – AEF Circuit for a High-Density 3-kW Server Rack Power Supply
        1. 9.2.1.1 Design Requirements
        2. 9.2.1.2 Detailed Design Procedure
          1. 9.2.1.2.1 Sense Capacitors
          2. 9.2.1.2.2 Inject Capacitor
          3. 9.2.1.2.3 Compensation Network
          4. 9.2.1.2.4 Injection Network
          5. 9.2.1.2.5 Surge Protection
        3. 9.2.1.3 Application Curves
    3. 9.3 Power Supply Recommendations
    4. 9.4 Layout
      1. 9.4.1 Layout Guidelines
      2. 9.4.2 Layout Example
  10. 10Device and Documentation Support
    1. 10.1 Device Support
      1. 10.1.1 Third-Party Products Disclaimer
      2. 10.1.2 Development Support
    2. 10.2 Documentation Support
      1. 10.2.1 Related Documentation
    3. 10.3 Receiving Notification of Documentation Updates
    4. 10.4 Support Resources
    5. 10.5 Trademarks
    6. 10.6 Electrostatic Discharge Caution
    7. 10.7 Glossary
  11. 11Mechanical, Packaging, and Orderable Information

Package Options

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

8.1 Overview

The TPSF12C1 is an active electromagnetic interference (EMI) filter that is designed to reduce common-mode (CM) conducted emissions in off-line power converter systems. Using a VSCI architecture, the device senses the high-frequency noise on each power line using a set of Y-rated capacitors, CSEN1 and CSEN2, then injects noise-canceling currents back into the power lines using a Y-rated capacitor, CINJ, along with a damping circuit that ensures stability. The device includes integrated filtering, compensation and protection circuitry.

The TPSF12C1 provides a low-impedance shunt path for CM noise in the frequency range of interest for EMI measurement. This feature can achieve approximately 15 to 30 dB of CM attenuation over the applicable frequency range (for example, 100 kHz to 3 MHz) helping to reduce the size of CM chokes, typically the largest components in the filter.

The TPSF12C1 operates over a supply voltage range of 8 V to 16 V and can withstand 18 V. The device features include:

  • Internal circuitry that simplifies compensation and design
  • Built-in supply voltage UVLO to ensure proper operation
  • Built-in thermal shutdown protection
  • An EN input that allows power saving when the system is idling

The active EMI filter circuit significantly reduces EMI filter cost, size, and weight, while helping to meet CISPR 11 and CISPR 32 Class B limits for conducted emissions. Leveraging a pin arrangement designed for simple layout that requires relatively few external components, the TPSF12C1 is specified for maximum ambient and junction temperatures of 105°C and 150°C, respectively.