DLPS071A October   2015  – February 2023 DLPA3005

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 SPI Timing Parameters
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Description
    3. 7.3 Feature Description
      1. 7.3.1 Supply and Monitoring
        1. 7.3.1.1 Supply
        2. 7.3.1.2 Monitoring
          1. 7.3.1.2.1 Block Faults
          2. 7.3.1.2.2 Auto LED Turn Off Functionality
          3. 7.3.1.2.3 Thermal Protection
      2. 7.3.2 Illumination
        1. 7.3.2.1 Programmable Gain Block
        2. 7.3.2.2 LDO Illumination
        3. 7.3.2.3 Illumination Driver A
        4. 7.3.2.4 RGB Strobe Decoder
          1. 7.3.2.4.1 Break Before Make (BBM)
          2. 7.3.2.4.2 Openloop Voltage
          3. 7.3.2.4.3 Transient Current Limit
        5. 7.3.2.5 Illumination Monitoring
          1. 7.3.2.5.1 Power Good
          2. 7.3.2.5.2 Ratio Metric Overvoltage Protection
        6. 7.3.2.6 Illumination Driver plus Power FETs Efficiency
      3. 7.3.3 External Power FET Selection
        1. 7.3.3.1 Threshold Voltage
        2. 7.3.3.2 Gate Charge and Gate Timing
        3. 7.3.3.3 RDS(ON)
      4. 7.3.4 DMD Supplies
        1. 7.3.4.1 LDO DMD
        2. 7.3.4.2 DMD HV Regulator
        3. 7.3.4.3 DMD/DLPC Buck Converters
        4. 7.3.4.4 DMD Monitoring
          1. 7.3.4.4.1 Power Good
          2. 7.3.4.4.2 Overvoltage Fault
      5. 7.3.5 Buck Converters
        1. 7.3.5.1 LDO Bucks
        2. 7.3.5.2 General Purpose Buck Converter
        3. 7.3.5.3 Buck Converter Monitoring
          1. 7.3.5.3.1 Power Good
          2. 7.3.5.3.2 Overvoltage Fault
        4. 7.3.5.4 Buck Converter Efficiency
      6. 7.3.6 Auxiliary LDOs
      7. 7.3.7 Measurement System
    4. 7.4 Device Functional Modes
    5. 7.5 Programming
      1. 7.5.1 SPI
      2. 7.5.2 Interrupt
      3. 7.5.3 Fast-Shutdown in Case of Fault
      4. 7.5.4 Protected Registers
    6. 7.6 Register Maps
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Component Selection for General-Purpose Buck Converters
      3. 8.2.3 Application Curve
    3. 8.3 System Example With DLPA3005 Internal Block Diagram
  9. 9 Power Supply Recommendations
    1. 9.1 Power-Up and Power-Down Timing
  10. 10Layout
    1. 10.1 Layout Guidelines
      1. 10.1.1 SPI Connections
      2. 10.1.2 RLIM Routing
      3. 10.1.3 LED Connection
    2. 10.2 Layout Example
    3. 10.3 Thermal Considerations
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Device Nomenclature
    2. 11.2 Third-Party Products Disclaimer
    3. 11.3 Related Links
    4. 11.4 Receiving Notification of Documentation Updates
    5. 11.5 Support Resources
    6. 11.6 Trademarks
    7. 11.7 Electrostatic Discharge Caution
    8. 11.8 Glossary
  12. 12Mechanical, Packaging, and Orderable Information
    1. 12.1 Package Option Addendum

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information
7.3.1.2.2 Auto LED Turn Off Functionality

The DLPA3005 can be supplied from an adapter. The DLPA3005 use several warning and detection levels, as indicated in the previous paragraphs, to prevent system damage in case the supply voltage becomes too low or even interrupted.

Interruption of the supply voltage occurs when, for example, the adapter is switched to another mains outlet. A change of supply voltage from, for example, 20 V to 8 V can occur, and thus the OVP level (which is ratio metric, see Section 7.3.2.5.2) could become lower than VLED. An OVP fault will be triggered and the system switches off.

The Auto_LED_Turn_Off functionality can be used to prevent the system from turning off in these circumstances. This function disables the LEDs when the supply voltage drops below LED_AUTO_OFF_LEVEL. When the Auto_LED_Turn_Off functionality is enabled (reg 0x01h), once a supply voltage drop is detected to below LED_AUTO_OFF_LEVEL, the LEDs will be switched off and the system should start sending lower current levels to have a lower VLED. After start using lower currents, the LEDs can be switched on again by disabling AUTO_LED_TURN_OFF function. As a result the system can continue working at the lower supply voltage using a lower intensity. Once the mains adapter is plugged in again, the Auto_LED_Turn_Off functionality can be enabled again. Now the LED currents can be restored to their original levels from before the supply voltage drop.