JAJSDL7D January   2016  – May 2021 TPS61194

PRODUCTION DATA  

  1. 1 特長
  2. 2 アプリケーション
  3. 3 概要
  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 (1) (1)
    6. 6.6  Internal LDO Electrical Characteristics
    7. 6.7  Protection Electrical Characteristics
    8. 6.8  Current Sinks Electrical Characteristics
    9. 6.9  PWM Brightness Control Electrical Characteristics
    10. 6.10 Boost and SEPIC Converter Characteristics
    11. 6.11 Logic Interface Characteristics
    12. 6.12 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 Integrated DC-DC Converter
      2. 7.3.2 Internal LDO
      3. 7.3.3 LED Current Sinks
        1. 7.3.3.1 Output Configuration
        2. 7.3.3.2 Current Setting
        3. 7.3.3.3 Brightness Control
      4. 7.3.4 Protection and Fault Detections
        1. 7.3.4.1 Adaptive DC-DC Voltage Control and Functionality of LED Fault Comparators
        2. 7.3.4.2 Overview of the Fault/Protection Schemes
    4. 7.4 Device Functional Modes
      1. 7.4.1 Device States
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Applications
      1. 8.2.1 Typical Application for 4 LED Strings
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
          1. 8.2.1.2.1 Inductor Selection
          2. 8.2.1.2.2 Output Capacitor Selection
          3. 8.2.1.2.3 Input Capacitor Selection
          4. 8.2.1.2.4 LDO Output Capacitor
          5. 8.2.1.2.5 Diode
        3. 8.2.1.3 Application Curves
      2. 8.2.2 SEPIC Mode Application
        1. 8.2.2.1 Design Requirements
        2. 8.2.2.2 Detailed Design Procedure
          1. 8.2.2.2.1 Inductor
          2. 8.2.2.2.2 Diode
          3. 8.2.2.2.3 Capacitor C1
        3. 8.2.2.3 Application Curves
  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 Device Support
      1. 11.1.1 Development Support
    2. 11.2 Documentation Support
      1. 11.2.1 Related Documentation
    3. 11.3 Receiving Notification of Documentation Updates
    4. 11.4 サポート・リソース
    5. 11.5 Trademarks
    6. 11.6 Electrostatic Discharge Caution
    7. 11.7 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

7.3.4.2 Overview of the Fault/Protection Schemes

A summary of the TPS61194fault detection behavior is shown in Table 7-3. 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 recovers automatically and enters normal operating mode (ACTIVE) after a recovery time of 100 ms if the fault condition has disappeared. When recovery is succesful, FAULT pin is released.

If a LED fault is detected, the device continues normal operation and only the faulty string is disabled. The fault is indicated via the FAULT pin which can be released by toggling VDDIO/EN pin low for a short period of 2 µs to 20 µs. LEDs are turned off for this period but the device stays in ACTIVE mode. If VDDIO/EN is low longer, the device goes to STANDBY and restarts when EN goes high again.

Table 7-3 Fault Detections
FAULT/
PROTECTION		FAULT NAMETHRESHOLDFAULT PINFAULT_
RECOVERY
STATE		ACTION
VIN overvoltage protectionVIN_OVP1. VIN > 42 V
2. VOUT > VSET_DCDC + 6..10 V.
VSET_DCDC is voltage value defined by logic during adaptation		YesYes1. Overvoltage is monitored from the beginning of soft start. Fault is detected if the duration of overvoltage condition is 100 µs minimum.
2. Overvoltage is monitored from the beginning of normal operation (ACTIVE mode). Fault is detected if over-voltage condition duration is 560 ms minimum (tfilter). After the first fault, detection filter time is reduced to 50 ms for following recovery cycles. When the device recovers and has been in ACTIVE mode for 160 ms, filter time is increased back to 560 ms.
VIN undervoltage lockoutVIN_UVLOFalling 3.9 V
Rising 4 V		YesYesDetects undervoltage condition at VIN pin. Sensed in all operating modes. Fault is detected if undervoltage condition duration is 100 µs minimum.
Open LED faultOPEN_LEDLOW_COMP thresholdYesNoDetected if the voltage of one or more current sinks is below threshold level, and DC-DC adaptive control has reached maximum voltage. Open string is removed from the DC-DC voltage control loop and current sink is disabled.
Fault pin is 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 ACTIVE. If VDDIO/EN is low longer, device goes to STANDBY and restarts when EN goes high again.
Shorted LED faultSHORT_LEDShorted string detection level 6 VYesNoDetected if the voltage of one or more current sinks is above shorted string detection level and at least one OUTx voltage is within headroom window. Shorted string is removed from the DC-DC voltage control loop and current sink is disabled.
Fault pin is released by toggling VDDIO/EN pin. If VDDIO/EN is low for a period of 2…20 µs, LEDs are turned off for this period but device stays ACTIVE. If VDDIO/EN is low longer, device goes to STANDBY and restarts when EN goes high again.
Thermal protectionTSD165°C
Thermal shutdown hysteresis 20°C		YesYesThermal shutdown is monitored from the beginning of soft start. Die temperature must decrease by 20°C for device to recover.
GUID-C56D622B-2D76-4D82-9248-A5AAA707356F-low.gifFigure 7-5 VIN Overvoltage Protection (DC-DC OVP)
GUID-48D1FE0D-A374-473F-8700-2F11AE45E69C-low.gifFigure 7-6 VIN Overvoltage Protection (VIN OVP)
GUID-6141C41E-E0A1-47FD-896C-116990635571-low.gifFigure 7-7 VIN Undervoltage Lockout
GUID-340A4B93-612E-4239-8906-0FA0C1C5C6C4-low.gifFigure 7-8 LED Open Fault
GUID-84E710C1-AC2A-4560-BC41-FC1B975D3706-low.gifFigure 7-9 LED Short Fault