SBVU068 august   2023 TPS7A78

 

  1.   1
  2.   Description
  3.   Features
  4.   4
  5. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 Specification
    4. 1.4 Device Information
  6. 2Hardware
    1. 2.1 Setup
      1. 2.1.1 Full-Bridge (FB) Test Equipment Connection
      2. 2.1.2 Half-Bridge (HB) Test Equipment Connection
    2. 2.2 Jumper Information
      1. 2.2.1  J1: LDO_IN
      2. 2.2.2  J2: Line VAC
      3. 2.2.3  J3: LDO_OUT
      4. 2.2.4  J4: LDO_IN Sense
      5. 2.2.5  J5: SCIN
      6. 2.2.6  J6: LDO_OUT Sense
      7. 2.2.7  J7: LDO_OUT/GND
      8. 2.2.8  J8: LDO_IN/GND
      9. 2.2.9  J9, J11, J13: GND
      10. 2.2.10 J10: Neutral VAC
      11. 2.2.11 J12: Second Surge Resistor Jumper
      12. 2.2.12 J14: Full-Bridge (FB) and Half-Bridge(HB) Configurations
      13. 2.2.13 J15: LDO Pin test header
      14. 2.2.14 J16 and J18: Power-Good (PG) and Power-Fail (PF) Signals
      15. 2.2.15 J17: Coin Cell Buffer VCC Jumper
    3. 2.3 Test Points
  7. 3Implementation Results
    1. 3.1 Performance Data and Results
  8. 4Hardware Design Files
    1. 4.1 Schematic
    2. 4.2 PCB Layouts
    3. 4.3 Bill of Materials (BOM)
  9. 5Compliance Information
    1. 5.1 Compliance and Certifications
      1. 5.1.1 Passing Pre-Compliance Conducted Emission Test Results Using Capacitors and Resistors in the Input Filter
      2. 5.1.2 Passing Pre-Compliance Conducted Emission Test Results Using Capacitors, Resistors and Inductors in the Input Filter
    2. 5.2 Surge Testing
    3. 5.3 EFT Compliance
    4. 5.4 ESD Compliance
  10. 6Additional Information
    1. 6.1 Trademarks

3.1 Performance Data and Results

Table 4-1 lists the electrical specifications for the TPS7A78EVM-041 evaluation module.

Table 3-1 TPS7A78EVM-041 Electrical Performance Specifications(1)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
INPUT CHARACTERISTICS
VAC AC input (RMS) 90 120 264 V
fAC Line frequency HB/FB 30/60 Hz
OUTPUT CHARACTERISTICS
VLDO_OUT Output voltage VAC = 120 V (60 Hz) 3.501 3.6 3.699 V
VLDO_OUT ripple Output ripple voltage VAC = 120 V (60 Hz) 10 mVpp
IOUT Output current VAC = 120 V (60 Hz) 16(2) 3 55(3) mA
(1) All measurements are done with a half-bridge (HB) default EVM setting 25 or 30 Hz (unless otherwise noted). 50 and 50 Hz figures are associated with the full-bridge (FB) configuration.
(2) Output current level is determined by the size of the cap-drop (C15), the size of the bulk capacitor (C8), and the device configuration. When VAC is 70 V (60 Hz), the EVM can source 16 mA (max); see Section 2.1 for EVM configuration and proper connection of test equipment.
(3) When VAC is 120 V (60 Hz), the EVM can source 55 mA (max) with a full-bridge configuration.

Startup

Two examples of typical startup behavior for the TPS7A78EVM-041 are shown below. Figure 4-1 showcases startup with the maximum rated output current of 30 mA. Figure 4-2 showcases startup and output curent of 70 mA. While the EVM has only been designed up to 30 mA, the second startup shows that, with proper configuration, the EVM can be utilized to cover the full current spectrum of the TPS7A78 device.

GUID-20230808-SS0I-HMTR-JC2R-BBHVKRNDBSVK-low.pngFigure 3-1 Startup with Iout = 30 mA
GUID-20230808-SS0I-MD9B-LDJC-7MRGQDLXJ91T-low.pngFigure 3-2 Startup with Iout = 70 mA