SNVS606L June   2009  – December 2014 LM3530

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 I2C Device Options
  6. 6 Pin Configuration and Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 I2C-Compatible Timing Requirements (SCL, SDA)
    7. 7.7 Simple Interface Timing
    8. 7.8 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1  Start-Up
      2. 8.3.2  Light Load Operation
      3. 8.3.3  Ambient Light Sensor
      4. 8.3.4  ALS Operation
      5. 8.3.5  ALS Averaging Time
        1. 8.3.5.1 Averager Operation
      6. 8.3.6  Zone Boundary Settings
      7. 8.3.7  Zone Boundary Trip Points and Hysteresis
      8. 8.3.8  Minimum Zone Boundary Settings
      9. 8.3.9  LED Current Control
      10. 8.3.10 Exponential or Linear Brightness Mapping Modes
      11. 8.3.11 PWM Input Polarity
      12. 8.3.12 I2C-Compatible Current Control Only
      13. 8.3.13 Simple Enable Disable With PWM Current Control
      14. 8.3.14 Ambient Light Current Control
      15. 8.3.15 Ambient Light Current Control + PWM
      16. 8.3.16 Interrupt Output
      17. 8.3.17 Overvoltage Protection
      18. 8.3.18 Hardware Enable
      19. 8.3.19 Thermal Shutdown
    4. 8.4 Device Functional Modes
      1. 8.4.1 Shutdown
      2. 8.4.2 I2C Mode
      3. 8.4.3 PWM + I2C Mode
      4. 8.4.4 ALS Mode
      5. 8.4.5 Simple Enable Mode
    5. 8.5 Programming
      1. 8.5.1 I2C-Compatible Interface
        1. 8.5.1.1 Start and Stop Condition
        2. 8.5.1.2 I2C-Compatible Address
        3. 8.5.1.3 Transferring Data
    6. 8.6 Register Maps
      1. 8.6.1 Register Descriptions
        1. 8.6.1.1 General Configuration Register (GP)
        2. 8.6.1.2 ALS Configuration Register
        3. 8.6.1.3 Brightness Ramp Rate Register
        4. 8.6.1.4 ALS Zone Information Register
        5. 8.6.1.5 ALS Resistor Select Register
        6. 8.6.1.6 Brightness Control Register
        7. 8.6.1.7 Zone Boundary Register
        8. 8.6.1.8 Zone Target Registers
  9. 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 LED Current Setting/Maximum LED Current
        2. 9.2.2.2 Maximum Duty Cycle
        3. 9.2.2.3 Peak Current Limit
        4. 9.2.2.4 Output Voltage Limitations
        5. 9.2.2.5 Output Capacitor Selection
        6. 9.2.2.6 Inductor Selection
        7. 9.2.2.7 Diode Selection
      3. 9.2.3 Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
      1. 11.1.1 Output Capacitor Placement
      2. 11.1.2 Schottky Diode Placement
      3. 11.1.3 Inductor Placement
      4. 11.1.4 Input Capacitor Selection and Placement
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Device Support
      1. 12.1.1 Third-Party Products Disclaimer
    2. 12.2 Documentation Support
      1. 12.2.1 Related Documentation
    3. 12.3 Trademarks
    4. 12.4 Electrostatic Discharge Caution
    5. 12.5 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

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订购信息

10 Power Supply Recommendations

The LM3530 operates from a 2.7-V to 5.5-V input voltage. The 500-kHz switching frequency for the boost can lead to ripple voltage on the input voltage rail. To minimize this, the input to the inductor should be well bypassed with a 1-µF (min) ceramic bypass capacitor (see Output Capacitor Selection).