SLVSC26B November   2013  – May 2024 TPS61162A , TPS61163A

PRODUCTION DATA  

  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 Electrical Characteristics
    6. 5.6 EasyScale Timing Requirements
    7. 5.7 Typical Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1  Boost Converter
      2. 6.3.2  IFBx Pin Unused
      3. 6.3.3  Enable and Start-up
      4. 6.3.4  Soft Start
      5. 6.3.5  Full-Scale Current Program
      6. 6.3.6  Brightness Control
      7. 6.3.7  Undervoltage Lockout
      8. 6.3.8  Overvoltage Protection
      9. 6.3.9  Overcurrent Protection
      10. 6.3.10 Thermal Shutdown
    4. 6.4 Device Functional Modes
      1. 6.4.1 One-Wire Digital Interface (EasyScale Interface)
      2. 6.4.2 PWM Control Interface
    5. 6.5 Programming
      1. 6.5.1 EasyScale Programming
  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 Inductor Selection
        2. 7.2.2.2 Schottky Diode Selection
        3. 7.2.2.3 Compensation Capacitor Selection
        4. 7.2.2.4 Output Capacitor Selection
      3. 7.2.3 Application Curves
      4. 7.2.4 Additional Application Circuits
    3. 7.3 Power Supply Recommendations
    4. 7.4 Layout
      1. 7.4.1 Layout Guidelines
      2. 7.4.2 Layout Example
  9. 8 Device and Documentation Support
    1. 8.1 Device Support
    2. 8.2 Related Links
    3. 8.3 Community Resources
    4. 8.4 Trademarks
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information

6.3.3 Enable and Start-up

In order to enable the device from shutdown mode, three conditions have to be met:

  1. POR (Power On Reset, that is, VIN voltage is higher than UVLO threshold);
  2. Logic high on EN pin; and
  3. PWM signal (logic high or PWM pulses) on PWM pin.
When these conditions are all met, an internal LDO linear regulator is enabled to provide supply to internal circuits and the device can start up.

The TPS61162A, TPS61163A support two dimming interfaces: one-wire digital interface (EasyScale interface) and PWM interface. TPS61162A, TPS61163A begin an EasyScale detection window after start-up to detect which interface is selected. If the EasyScale interface is needed, signals of a specific pattern should be input into EN pin during the EasyScale detection window; otherwise, PWM dimming interface will be enabled (see details in Section 6.4.1).

After the EasyScale detection window, the TPS61162A, TPS61163A check the status of IFBx pins. If one IFBx pin is detected to connect to ground, the corresponding channel will be disabled and removed from the control loop. Then the soft-start begins, and the boost converter starts switching. If both IFBx pins are shorted to ground, the TPS61162A, TPS61163A will not start up.

Either pulling EN pin low for more than 2.5ms or pulling PWM pin low for more than 20ms can disable the device, and the TPS61162A, TPS61163A enters into shutdown mode.

If the EasyScale is selected as unique control to enable/disable and change brightness for TPS61162A,TPS61163A, it is required to pull EN pin more than 100ms to enable the TPS61162A, TPS61163A from the previous disable. The 100ms time period can ensure the fully voltage discharge remained on IFBx pin.