JAJSQU6A January   2024  – June 2024 TPS56837H

PRODUCTION DATA  

  1.   1
  2. 1 特長
  3. 2 アプリケーション
  4. 3 概要
  5. 4 Pin Configuration and 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 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  The Adaptive On-Time Control and PWM Operation
      2. 6.3.2  Mode Selection
      3. 6.3.3  Eco-mode Control Scheme
      4. 6.3.4  Soft Start and Prebiased Soft Start
      5. 6.3.5  Enable and Adjusting Undervoltage Lockout
      6. 6.3.6  Output Overcurrent Limit and Undervoltage Protection
      7. 6.3.7  Overvoltage Protection
      8. 6.3.8  UVLO Protection
      9. 6.3.9  Thermal Shutdown
      10. 6.3.10 Output Voltage Discharge
      11. 6.3.11 Power Good
      12. 6.3.12 Large Duty Operation
    4. 6.4 Device Functional Modes
      1. 6.4.1 Standby Operation
      2. 6.4.2 Light Load Operation
  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 Output Voltage Resistors Selection
        2. 7.2.2.2 Output Filter Selection
        3. 7.2.2.3 Input Capacitor Selection
        4. 7.2.2.4 Bootstrap Capacitor Selection
      3. 7.2.3 Application Curves
    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 Documentation Support
      1. 8.1.1 Related Documentation
    2. 8.2 ドキュメントの更新通知を受け取る方法
    3. 8.3 サポート・リソース
    4. 8.4 Trademarks
    5. 8.5 静電気放電に関する注意事項
    6. 8.6 用語集
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information

6.3.2 Mode Selection

TPS56837H and TPS56837HA have MODE pin that can offer three adjustable cycle-by-cycle over current limit for low-side MOSFET. The device reads the voltage on the MODE pin during start-up and latches onto one of the MODE options listed in Table 6-1. The voltage on the MODE pin can be set by connecting a resistor to AGND. A guideline for the MODE resistor in 1% resistors is shown in Table 6-1. The MODE pin setting can be reset only by a VIN or EN power cycling.

Table 6-1 MODE Pin Settings
MODE PinOver Current Limit
R = 10kohmILIM-1 (Typ = 7.2A)
R = 30.1kohmILIM (Typ = 9.6A)
R = 52.3kohmILIM+1 (Typ = 12A)
Figure 6-1 shows the typical start-up sequence of the device after the enable signal triggers the EN turn-on threshold. After the voltage of internal VCC crosses the UVLO rising threshold, the MODE setting is read. After this process, the MODE is latched and does not change until VIN or EN toggles to restart this device. Then, after a delay, the internal soft-start function begins to ramp up and Vout ramps up smoothly. When Vout is up to the reference voltage, PGOOD turns to high after a delay.
TPS56837H TPS56837HA Power-Up SequenceFigure 6-1 Power-Up Sequence