SLLSFZ4 June   2024 ISOM8600

PRODUCTION DATA  

  1.   1
  2. Features
  3. Applications
  4. Description
  5. Pin Configuration and Functions
  6. 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 Electrical Characteristics
    7. 5.7 Switching Characteristics
  7. Typical Characteristics
  8. Parameter Measurement Information
  9. Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
    4. 8.4 Device Functional Modes
  10. 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 Sizing RIN
      3. 9.2.3 Application Curve
    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 Documentation Support
      1. 10.1.1 Related Documentation
    2. 10.2 Receiving Notification of Documentation Updates
    3. 10.3 Support Resources
    4. 10.4 Trademarks
    5. 10.5 Electrostatic Discharge Caution
    6. 10.6 Glossary
  12. 11Revision History
  13. 12Mechanical, Packaging, and Orderable Information

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Sizing RIN

The input side of the ISOM8600 is current-driven. Placing a series resistor, RIN, in series with the input as shown in Figure 9-1 is recommended to limit the amount of current flowing into the AN pin.

RIN can be sized to minimize current flow and power consumption through the ISOM8600 input-side. RIN must be a value that limits the input forward current to be within the Recommended Operating Conditions for the ISOM8600. The equation to calculate RIN for a given input voltage, VIN, and desired input forward current, IF, is shown in Equation 1 where VF is the maximum specification for the ISOM8600 input forward voltage:

Equation 1. RIN = VIN - VF MAXIF

For example, with a 24V input and 2mA desired IF, RIN can be calculated as:

Equation 2. R I N   =   24 V   -   1.5 V 2 m A   = 11.25 k