SLLSFW9 April   2024 ISO7741TA-Q1

ADVANCE INFORMATION  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
    1.     Pin 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 Transformer
    10. 5.10 Electrical Characteristics—5-V Supply
    11. 5.11 Supply Current Characteristics—5-V Supply
    12. 5.12 Electrical Characteristics—3.3-V Supply
    13. 5.13 Supply Current Characteristics—3.3-V Supply
    14. 5.14 Electrical Characteristics—2.5-V Supply 
    15. 5.15 Supply Current Characteristics—2.5-V Supply
    16. 5.16 Switching Characteristics—5-V Supply
    17. 5.17 Switching Characteristics—3.3-V Supply
    18. 5.18 Switching Characteristics—2.5-V Supply
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1 Electromagnetic Compatibility (EMC) Considerations
      2. 6.3.2 Push-Pull Converter
      3. 6.3.3 Core Magnetization
    4. 6.4 Device Functional Modes
      1. 6.4.1 Device I/O Schematics
      2. 6.4.2 Start-Up Mode
      3. 6.4.3 Operating Mode
      4. 6.4.4 Spread Spectrum Clocking
  8. 7 Application and Implementation
    1. 7.1 Application Information
    2. 7.2 Typical Application
      1. 7.2.1 Design Requirements
      2. 7.2.2 Detailed Design Procedure
        1. 7.2.2.1 Drive Capability
        2. 7.2.2.2 LDO Selection
        3. 7.2.2.3 Diode Selection
        4. 7.2.2.4 Capacitor Selection
        5. 7.2.2.5 Transformer Selection
          1. 7.2.2.5.1 V-t Product Calculation
          2. 7.2.2.5.2 Turns Ratio Estimate
          3. 7.2.2.5.3 Recommended Transformers
      3. 7.2.3 Application Curve
        1. 7.2.3.1 Insulation Lifetime
      4. 7.2.4 System Examples
        1. 7.2.4.1 Higher Output Voltage Designs
  9. 8 Device and Documentation Support
    1. 8.1 Documentation Support
      1. 8.1.1 Related Documentation
    2. 8.2 Receiving Notification of Documentation Updates
    3. 8.3 Support Resources
    4. 8.4 Trademarks
    5. 8.5 Electrostatic Discharge Caution
    6. 8.6 Glossary
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information

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発注情報
7.2.2.5.3 Recommended Transformers

Depending on the application, use the minimum configuration in Figure 7-5 or standard configuration in Figure 7-6.

ISO7741TA-Q1 ISO7741TB-Q1 Unregulated Output for Low-Current Loads With Wide Supply Range Figure 7-5 Unregulated Output for Low-Current Loads With Wide Supply Range
ISO7741TA-Q1 ISO7741TB-Q1 Regulated Output for Stable Supplies and High Current Loads Figure 7-6 Regulated Output for Stable Supplies and High Current Loads

The Wurth Electronics Midcom isolation transformers in Table 7-4 are optimized designs for the device, providing high efficiency and small form factor at low-cost.

The 1:1.1 and 1:1.7 turns-ratios are designed for logic applications with wide supply rails and low load currents. These applications operate without LDO, thus achieving further cost-reduction.

Table 7-4 Recommended Isolation Transformers Optimized for the Device
TURNS
RATIO		V × T
(Vμs)		ISOLATION
(VRMS)		DIMENSIONS
(mm)		APPLICATIONLDO(1)ORDER NO.MANUFACTURER
1:1.1 ±2%725006.73 x 10.05 x 4.193.3V → 3.3V, 100mA, ISO7741TB-Q1No760390011Wurth Electronics / Midcom
1:1.1 ±2%115V → 5V, 100mA, ISO7741TB-Q1760390012
1:1.7 ±2%3.3V → 5V, 100mA, ISO7741TB-Q1760390013
1:1.3 ±2%3.3V → 3.3V, 100mA, ISO7741TB-Q1 Yes760390014
1:1.3 ±2%5V → 5V, 100mA, ISO7741TB-Q1760390014
1:2.1 ±2%3.3V → 5V, 100mA, ISO7741TB-Q1760390015
1.23:1 ±2%5V → 3.3V, 100mA, ISO7741TB-Q1750313710
1:1.7 ±2%8.98.3 x 12.6 x 4.13.3V → 3.3V, 1A, ISO7741TB-Q1 750316028
1:2.1 ±2%3.3V → 5V, 1A, ISO7741TB-Q1No750316029
1.3:1 ±2%10.85V → 3.3V, 1A, ISO7741TB-Q1750316030
1:1.1 ±2%8.63.3V → 3.3V, 1A, ISO7741TB-Q1
5V → 5V, 1A, ISO7741TB-Q1		750315371
1:1.1 ±2%1150009.14 x 12.7 x 7.373.3V → 3.3V, 100mA, ISO7741TB-Q1750313734
1:1.1 ±2%5V → 5V, 100mA, ISO7741TB-Q1750313734
1:1.7 ±2%3.3V → 5V, 100mA, ISO7741TB-Q1750313769
1:1.3 ±2%3.3V → 3.3V, 100mA, ISO7741TB-Q1
5V → 5V, 100mA, ISO7741TB-Q1		Yes750313638
1:2.1 ±2%3.3V → 5V, 100mA, ISO7741TB-Q1750313626
1.3:1 ±2%5V → 3.3V, 100mA, ISO7741TB-Q1No750313638
1:1.75 ±2%4112.32 x 15.41 x 11.053.3V → 3.3V, 1A, ISO7741TA-Q1 Yes750316031
1:2 ±2%3.3V → 5V, 1A, ISO7741TA-Q1 No750316032
1.3:1 ±2%425.0V → 3.3V, 1A, ISO7741TA-Q1 750316033
1:1.1 ±2%2312.32 x 15.41 x 11.893.3V → 3.3V, 1A, ISO7741TA-Q1
5V → 5V, 1A, ISO7741TA-Q1 		750315240
1:3.5 ±2% 9 9.14 x 12.95 x 7.62

5V → 17.5V, 100mA,ISO7741TB-Q1

750342879
1:3.9 ±2% 9.17 x 12.7 x 7.62

5V → 19.5V, 100mA,ISO7741TB-Q1

750343725
1:3.75 ±2% 9.5 2500 8.3 x 12.6 x 4.1

5V → 18.75V, 100mA,ISO7741TB-Q1

78931812518
1:4.75 ±2%

5V → 23.75V, 100mA,ISO7741TB-Q1

78931812523
1:2.5 ±2%

5V → 12.5V, 200mA,ISO7741TB-Q1

78931812512
1:3.13 ±2%

5V → 15.65V, 200mA,ISO7741TB-Q1

78931812515
1:3.5 ±2% 16 6000 9.14 x 12.7 x 7.62

5V → 17.5V, 100mA,ISO7741TB-Q1

750320340
1:1.3 ±3%11500010.4 x 12.2 x 6.13.3V → 3.3V, 300mA, ISO7741TB-Q1
5V → 5V, 300mA, ISO7741TB-Q1 		NoHCT-SM-1.3-8-2Bourns
1:1.5 ±3%34.4250010 x 12.07 x 5.973.3V → 3.3V, 1A, ISO7741TB-Q1
5V → 5V, 1A, ISO7741TA/B-Q1		YesDA2303-ALCoilcraft
1:2.2 ±3%21.5250010 x 12.07 x 5.973.3V → 5V, 1A, ISO7741TA/B-Q1DA2304-AL
(1) For configurations with LDO, a higher voltage than the required output voltage is generated, to allow for LDO drop-out. Figures show the voltage and efficiency at the LDO input.