SNVSBZ6 May   2021 TPS92380 , TPS92381

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Device Comparison Table
  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  Internal LDO Electrical Characteristics
    7. 7.7  Protection Electrical Characteristics
    8. 7.8  Current Sinks Electrical Characteristics
    9. 7.9  PWM Brightness Control Electrical Characteristics
    10. 7.10 Boost and SEPIC Converter Characteristics
    11. 7.11 Logic Interface Characteristics
    12. 7.12 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 Integrated DC-DC Converter
        1. 8.3.1.1 DC-DC Converter Parameter Configuration
          1. 8.3.1.1.1 Switching Frequency
          2. 8.3.1.1.2 Spread Spectrum and External SYNC
          3. 8.3.1.1.3 Recommended Component Value and Internal Parameters
          4. 8.3.1.1.4 DC-DC Converter Switching Current Limit
          5. 8.3.1.1.5 DC-DC Converter Light Load Mode
        2. 8.3.1.2 Adaptive Voltage Control
          1. 8.3.1.2.1 Using Two-Divider
          2. 8.3.1.2.2 Using T-Divider
          3. 8.3.1.2.3 External Compensation
      2. 8.3.2 Internal LDO
      3. 8.3.3 LED Current Sinks
        1. 8.3.3.1 LED Output Configuration
        2. 8.3.3.2 LED Current Setting
        3. 8.3.3.3 Brightness Control
      4. 8.3.4 Fault Detections and Protection
        1. 8.3.4.1 Supply Fault and Protection
          1. 8.3.4.1.1 VIN Undervoltage Fault (VIN_UVLO)
          2. 8.3.4.1.2 VIN Overvoltage Fault (VIN_OVP)
        2. 8.3.4.2 Boost Fault and Protection
          1. 8.3.4.2.1 Boost Overvoltage Fault (BST_OVP)
          2. 8.3.4.2.2 SW Overvoltage Fault (SW_OVP)
        3. 8.3.4.3 LED Fault and Protection (LED_OPEN and LED_SHORT)
        4. 8.3.4.4 Thermal Fault and Protection (TSD)
        5. 8.3.4.5 Overview of the Fault and Protection Schemes
    4. 8.4 Device Functional Modes
      1. 8.4.1 STANDBY State
      2. 8.4.2 SOFT START State
      3. 8.4.3 BOOST START State
      4. 8.4.4 NORMAL State
      5. 8.4.5 FAULT RECOVERY State
      6. 8.4.6 State Diagram and Timing Diagram for Start-up and Shutdown
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Applications
      1. 9.2.1 Typical Application for 4 LED Strings
      2. 9.2.2 Design Requirements
      3. 9.2.3 Detailed Design Procedure
        1. 9.2.3.1 Inductor Selection
        2. 9.2.3.2 Output Capacitor Selection
        3. 9.2.3.3 Input Capacitor Selection
        4. 9.2.3.4 LDO Output Capacitor
        5. 9.2.3.5 Diode
      4. 9.2.4 Application Curves
      5. 9.2.5 SEPIC Mode Application
        1. 9.2.5.1 Design Requirements
        2. 9.2.5.2 Detailed Design Procedure
          1. 9.2.5.2.1 Inductor
          2. 9.2.5.2.2 Diode
          3. 9.2.5.2.3 Capacitor C1
        3. 9.2.5.3 Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Device Support
      1. 12.1.1 Development Support
    2. 12.2 Documentation Support
      1. 12.2.1 Related Documentation
    3. 12.3 Receiving Notification of Documentation Updates
    4. 12.4 Support Resources
    5. 12.5 Trademarks
    6. 12.6 Electrostatic Discharge Caution
    7. 12.7 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

8.3.4.5 Overview of the Fault and Protection Schemes

A summary of the TPS9238x fault detection behavior is shown in Table 8-3. Detected faults (excluding LED open or short) cause device to enter FAULT RECOVERY state. In FAULT_RECOVERY the DC-DC and LED current sinks of the device are disabled, and the FAULT pin is pulled low. The device will exit FAULT RECOVERY mode after 100 ms and try the start-up sequence again. When recovery is successful and device enters into NORMAL state, the FAULT pin is released high.

Table 8-3 Fault Detections
FAULT/
PROTECTION		FAULT NAMECONDITIONFAULT PINEnter FAULT_
RECOVERY
STATE		ACTIVE STATEACTION
VIN overvoltage protectionVIN_OVPVIN > 43 V
YesYesSOFT START, BOOST START, NORMALDevice enters into FAULT RECOVERY state, and restarts after 100 ms.
VIN undervoltage protectionVIN_UVLOEffective when VIN < 3.85 V
Released when VIN > 4 V		YesYesSOFT START, BOOST START, NORMALDevice enters into FAULT RECOVERY state, and restarts after 100 ms.
Open LED faultLED _OPENAdaptive Voltage is max. and
any OUTx voltage < 0.9 V		YesNoNORMALOpen string is removed from the DC-DC voltage control loop and output is disabled.
Fault pin low could be released by toggling VDDIO/EN pin, If VDDIO/EN is low for a period of 2 µs to 20 µs, LEDs are turned off for this period but device stays in NORMAL.
Shorted LED faultLED_SHORTOne of OUTx voltage is [0.9 V, 1.9 V] and
any OUTx voltage > 6 V		YesNoNORMALShort string is removed from the DC-DC voltage control loop and output is disabled.
Fault pin low could be released by toggling VDDIO/EN pin, If VDDIO/EN is low for a period of 2 µs to 20 µs, LEDs are turned off for this period but device stays NORMAL.
Boost overvoltage protectionBST_OVPVFB > 2.3 VYesYesNORMALFault is detected if boost overvoltage condition duration is more than 560 ms.
Device enters into FAULT RECOVERY state, and restarts after 100 ms.
SW overvoltage protectionSW_OVPVSW > 49 VYesYesSOFT START, BOOST START, NORMALDevice enters into FAULT RECOVERY state, and restarts after 100 ms.
Thermal protectionTSDEffective when Tj > 165 °C
Released when Tj < 145 °C		YesYesSOFT START, BOOST START, NORMALDevice enters into FAULT RECOVERY state, and restarts until TSD fault is released.