ZHCSPR0B april   2022  – august 2023 TPSI3052

PRODUCTION DATA  

  1.   1
  2. 1 特性
  3. 2 应用
  4. 3 说明
  5. 4 Revision History
  6. 5 Pin Configuration and Functions
  7. 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  Power Ratings
    6. 6.6  Insulation Specifications
    7. 6.7  Safety-Related Certifications
    8. 6.8  Safety Limiting Values
    9. 6.9  Electrical Characteristics
    10. 6.10 Switching Characteristics
    11. 6.11 Insulation Characteristic Curves
    12. 6.12 Typical Characteristics
  8. 7 Parameter Measurement Information
  9. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Transmission of the Enable State
      2. 8.3.2 Power Transmission
      3. 8.3.3 Gate Driver
      4. 8.3.4 Modes Overview
      5. 8.3.5 Three-Wire Mode
      6. 8.3.6 Two-Wire Mode
      7. 8.3.7 VDDP, VDDH, and VDDM Undervoltage Lockout (UVLO)
      8. 8.3.8 Power Supply and EN Sequencing
      9. 8.3.9 Thermal Shutdown
    4. 8.4 Device Functional Modes
  10. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1 Two-Wire or Three-Wire Mode Selection
        2. 9.2.2.2 Standard Enable, One-Shot Enable
        3. 9.2.2.3 CDIV1, CDIV2 Capacitance
        4. 9.2.2.4 RPXFR Selection
        5. 9.2.2.5 CVDDP Capacitance
        6. 9.2.2.6 Gate Driver Output Resistor
        7. 9.2.2.7 Start-up Time and Recovery Time
        8. 9.2.2.8 Supplying Auxiliary Current, IAUX From VDDM
        9. 9.2.2.9 VDDM Ripple Voltage
      3. 9.2.3 Application Curves
    3. 9.3 Power Supply Recommendations
    4. 9.4 Layout
      1. 9.4.1 Layout Guidelines
      2. 9.4.2 Layout Example
  11. 10Device and Documentation Support
    1. 10.1 Related Links
    2. 10.2 接收文档更新通知
    3. 10.3 支持资源
    4. 10.4 Trademarks
    5. 10.5 静电放电警告
    6. 10.6 术语表
  12. 11Mechanical, Packaging, and Orderable Information

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9.2.2.8 Supplying Auxiliary Current, IAUX From VDDM

The TPSI3052 is capable of providing power from VDDM to support external auxiliary circuitry as shown in Figure 9-10. 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.

GUID-20210924-SS0I-Z3JK-BVNT-NVKSFWBQHMSH-low.svg Figure 9-3 Supplying Auxiliary Power From VDDM

As an example, assume that the auxiliary circuitry requires an average current of 4 mA. Table 9-4 summarizes the results from the TPSI3052 calculator tool. The Calculator tool can be found at Design Calculator.

Table 9-4 Results from the TPSI3052 Calculator Tool, TA = 25°C, Three-Wire Mode with IAUX = 4 mA
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 5.3 25.0 5.9 0.35 N/A N/A N/A N/A
9.09 21.1 8.3 39.6 10.0 0.62 N/A N/A N/A N/A
11 40.0 15.8 75.1 26.8 1.74 N/A N/A N/A N/A
12.7 53.3 21.1 100.1 36.1 2.35 3557 96.0 10.4 4.1
14.7 66.7 26.4 125.2 45.5 2.98 2285 60.1 16.6 6.0
16.5 80.0 31.6 150.2 58.8 3.86 1549 39.3 25.5 8.6
20 93.3 36.9 175.2 68.8 4.52 1262 31.2 32.1 10.0

Based on the results in Table 9-4, several observations can be made:

  • With RPXFR = 7.32 kΩ , RPXFR = 9.09 kΩ, and RPXFR = 11 kΩ, insufficient power is available to meet the application power needs specified in the design requirements in Table 9-1.
  • With RPXFR = 12.7 kΩ and higher, sufficient power is transferred to meet the specified design requirements, however, for this design, RPXFR = 14.7 kΩ was selected for additional margin.
  • 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 9-4 with IAUX = 0 mA.