SLVSIA7 March   2025 TPSI3050M

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1  Absolute Maximum Ratings
    2. 5.2  ESD Ratings
    3. 5.3  Recommended Operating Conditions
    4. 5.4  Thermal Information
    5. 5.5  Power Ratings
    6. 5.6  Insulation Specifications
    7. 5.7  Safety-Related Certifications
    8. 5.8  Safety Limiting Values
    9. 5.9  Electrical Characteristics
    10. 5.10 Switching Characteristics
    11. 5.11 Insulation Characteristic Curves
    12. 5.12 Typical Characteristics
  7. 6 Parameter Measurement Information
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1  Transmission of the Enable State
      2. 7.3.2  Power Transmission
      3. 7.3.3  Gate Driver
      4. 7.3.4  Modes Overview
      5. 7.3.5  Three-Wire Mode
      6. 7.3.6  Two-Wire Mode
      7. 7.3.7  VDDP, VDDH, and VDDM Undervoltage Lockout (UVLO)
      8. 7.3.8  Keep-Off Circuitry
      9. 7.3.9  Power Supply and EN Sequencing
      10. 7.3.10 Thermal Shutdown
    4. 7.4 Device Functional Modes
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Two-Wire or Three-Wire Mode Selection
        2. 8.2.2.2 CDIV1, CDIV2 Capacitance
        3. 8.2.2.3 RPXFR Selection
        4. 8.2.2.4 CVDDP Capacitance
        5. 8.2.2.5 Gate Driver Output Resistor
        6. 8.2.2.6 Start-up Time and Recovery Time
        7. 8.2.2.7 Supplying Auxiliary Current, IAUX From VDDM
        8. 8.2.2.8 VDDM Ripple Voltage
      3. 8.2.3 Application Curves
      4. 8.2.4 Insulation Lifetime
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Layout Example
  10. 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
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

8.2.2.7 Supplying Auxiliary Current, IAUX From VDDM

The TPSI3050M is capable of providing power from VDDM to support external auxiliary circuitry as shown in Figure 8-3. In this case, the required transfer power must include the additional power consumed by the auxiliary circuitry on the VDDM rail. The RPXFR value must be set to meet the overall power requirements.

TPSI3050M Supplying Auxiliary Power From VDDMFigure 8-3 Supplying Auxiliary Power From VDDM

As an example, assume that the auxiliary circuitry requires an average current of 4mA. Table 8-4 summarizes the results from the TPSI3050M calculator tool. The Calculator tool can be found at Design Calculator.

Note: The results shown were captured at the time of publication and can differ from the latest version of the calculator tool. Refer to the latest version of the design calculator.
Table 8-4 Results From the TPSI3050M Calculator Tool, TA = 25°C, Three-Wire Mode With IAUX = 4mA
RPXFR, kΩ Power Converter Duty Cycle, % IVDDP, mA PIN, mW POUT, mW IOUT, mA tSTART, µs tRECOVER, µs fEN_MAX, kHz IAUX_MAX, mA
7.32 13.3 5.7 27.2 7.6 0.46 N/A N/A N/A N/A
9.09 21.1 9.1 43.1 12.7 0.80 N/A N/A N/A N/A
11 40.0 17.2 81.8 30.8 2.00 N/A N/A N/A N/A
12.7 53.3 22.9 109.0 41.5 2.71 2691 36.4 27.5 5.18
14.7 66.7 28.7 136.4 52.3 3.42 1834 28.9 34.6 7.29
16.5 80.0 34.4 163.6 66.1 4.34 1327 22.8 43.8 10.00
20 93.3 40.2 190.8 77.4 5.08 1096 19.5 51.2 10.00

Based on the results in Table 8-4, several observations can be made:

  • With RPXFR = 7.32kΩ , RPXFR = 9.09kΩ, and RPXFR = 11kΩ, insufficient power is available to meet the application power needs specified in the design requirements in Table 8-1.
  • With RPXFR = 12.7kΩ and higher, sufficient power is transferred to meet the specified design requirements.
  • For a given RPXFR, because a significant amount of the transferred power is being provided to the auxiliary circuitry, tSTART is longer, and fMAX reduced when compared to the results shown in Table 8-4 with IAUX = 0mA.