SLVS641B April   2008  – March  2015 TL4242

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 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 Electrical Characteristics
    6. 6.6 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 PWM Input
      2. 7.3.2 ST Output
        1. 7.3.2.1 Function and Timing Diagram
    4. 7.4 Device Functional Modes
  8. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Input Supply Voltage
      2. 8.1.2 Power Dissipation in TL4242
      3. 8.1.3 Setting the Output Current
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Input Voltage
        2. 8.2.2.2 Shunt Resistor
      3. 8.2.3 Application Curve
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Trademarks
    2. 11.2 Electrostatic Discharge Caution
    3. 11.3 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

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9 Power Supply Recommendations

The input voltage at the I pin must be greater than the sum of the LED forward voltages, the voltage drop across the TL4242 (from I to Q), and the voltage drop across the shunt resistor RREF. For an example of this calculation, refer to Typical Application. The input voltage should not exceed the recommended maximum operation voltage of 42 V.