ZHCSUF1 January   2024 TPS7H3014-SP

ADVANCE INFORMATION  

  1.   1
  2. 1 特性
  3. 2 应用
  4. 3 说明
  5. 4 Device Options
  6. 5 Pin Configuration and Functions
  7. 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 Timing Requirements
    7. 6.7 Quality Conformance Inspection
    8. 6.8 Typical Characteristics
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Input Voltage (IN), VLDO and REFCAP
        1. 7.3.1.1 Undervoltage Lockout (VPOR_IN < VIN < UVLO)
        2. 7.3.1.2 Power-On Reset (VIN < VPOR_IN )
      2. 7.3.2 SENSEx Inputs
        1. 7.3.2.1 VTH_SENSEX and VONx
        2. 7.3.2.2 IHYS_SENSEx and VOFFx
        3. 7.3.2.3 Top and Bottom Resistive Divider Design Equations
      3. 7.3.3 Output Stages (ENx,SEQ_DONE,PWRGD,PULL_UP1 and PULL_UP2)
      4. 7.3.4 User-Programmable TIMERS
        1. 7.3.4.1 DLY_TMR
        2. 7.3.4.2 REG_TMR
      5. 7.3.5 UP and DOWN
      6. 7.3.6 FAULT
      7. 7.3.7 State Machine
    4. 7.4 Daisy Chain
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Self Contained – Sequence UP and DOWN
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
          1. 8.2.1.2.1 Input Power Supplies and Decoupling Capacitors
          2. 8.2.1.2.2 UP and DOWN Thresholds
          3. 8.2.1.2.3 SENSEx Thresholds
        3. 8.2.1.3 Application Curves
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Documentation Support
      1. 9.1.1 Related Documentation
    2. 9.2 接收文档更新通知
    3. 9.3 支持资源
    4. 9.4 Trademarks
    5. 9.5 静电放电警告
    6. 9.6 术语表
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

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7.3.2.2 IHYS_SENSEx and VOFFx

The TPS7H3014 has a built-in hysteresis current of 24μA with an accuracy of ±3% (with RHYS = 50kΩ). The hysteresis current is equivalent to REFCAP/RHYS. A tolerance of 0.1% for the RHYS is recommended as it ultimately affects the hysteresis current accuracy. This current is mirrored internally across all SENSEx inputs. This hysteresis current becomes active when the SENSEx voltage is greater than the threshold voltage (599mV ±1%), same as VOUTx > VONx (Refer to Equation 3 and Figure 7-2). This current (IHYS) multiplied by the RTOPx resistance induces a voltage (VHYSx) that is added to the SENSEx node, effectively boosting (incrementing) the node voltage. During sequence down, or an undervoltage event when the VOUTx is decrementing, it will need to drop below the VOFF voltage in order to be considered as an out of regulation (or fault). The hysteresis voltage is defined as:
Equation 4. V H Y S x _ N O M I N A L   ( V )   =   I H Y S _ S E N S E x × R T O P x

Where:

  • IHYS_SENSEx = 24 × 10–6 Amps (or 24μA)
  • RTOPx units are in Ohms (Ω)

The "off" voltage (or out of regulation) voltage can be calculated as:

Equation 5. V O F F x _ N O M I N A L   ( V )   =   V O N x _ N O M I N A L - V H Y S x _ N O M I N A L

Using Equation 1 and Equation 5

Equation 6. V O F F x _ N O M I N A L   ( V ) = 1 + R T O P x R B O T T O M x × V T H _ S E N S E x -   I H Y S _ S E N S E x × R T O P x

Where:

  • VTH_SENSEx is the nominal sense threshold voltage of 0.599V
  • IHYS_SENSEx = 24 × 10–6 Amps (or 24μA)
  • RTOPx and RBOTTOMx units are in Ohms (Ω)

The VOFF error (using the derivative method and assuming all variables are uncorrelated) can be calculated as:

Equation 7. V O F F x _ E R R O R   ( V ) = ± A + B + C + D R B O T T O M x 2

Where the equation terms are:

Equation 8. A = I H Y S _ S E N S E x 2 × I H Y S _ S E N S E x _ A C C 2 × R T O P x 2 × R B O T T O M x 2
Equation 9. B = R T O L 2 × R T O P x 2 × V T H _ S E N S E x 2
Equation 10. C = R T O L 2 × R T O P x 2 × I H Y S _ S E N S E x × R B O T T O M x - V T H _ S E N S E x 2
Equation 11. D = V T H _ S E N S E x 2 × V T H _ S E N S E x _ A C C 2 × R T O P x + R B O T T O M x 2

Where:

  • RTOL is the resistors tolerance (same for top and bottom resistors) as numeric value. For example, for 0.1% tolerance resistors, we use 0.001.
  • VTH_SENSEx_ACC is the SENSEx threshold accuracy as numeric value (in this case 0.01).
  • IHYS_SENSEx_ACC is the hysteresis current accuracy as numeric value (in this case 0.03)
  • VTH_SENSEx is the nominal sense threshold voltage of 0.599V
  • IHYS_SENSEx = 24 × 10–6 Amps (or 24μA)
  • RTOPx and RBOTTOMx units are in Ohms (Ω)

Equation 12. V O F F x = V O F F x _ N O M I N A L   ±   V O F F x _ E R R O R

Using Equation 6 and Equation 7 we can calculate the off voltage range as:

Figure 7-3, shows a conceptual diagram of the rising and falling voltage, it also shows the errors on this voltage due to VTH accuracy, IHYS accuracy, and the resistive divider tolerances. At the system level, these errors have to be taken into account for a robust design.

GUID-20221028-SS0I-HWKQ-6C1L-HJTQR9BWDBFH-low.svg Figure 7-3 Rising and Falling Thresholds Voltages for the SENSEx Comparators