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

封装选项

机械数据 (封装 | 引脚)
散热焊盘机械数据 (封装 | 引脚)
订购信息
8.2.1.2.3 SENSEx Thresholds

The SENSEx inputs are used to monitor the voltage rails to be sequenced up and down. For this design the output voltages to be sequenced and monitored are:

  1. VOUT1 = 3.3V
  2. VOUT2 = 0.8V
  3. VOUT3 = 1.5V
  4. VOUT4 = 0.88V

The VON and VOFF are selected to be 90% and 10% of the nominal voltage rail, for all the rails. Using Equation 13 and Equation 14 we can calculate the top and bottom reference resistors and select the closest resistor values using 0.1% resistor values. Table 8-2 shows the reference (or calculated) top and bottom resistors. Table 8-3 shows the selected resistors for the application.

Table 8-2 SENSEx Reference Nominal Resistors
Channel # VON (V) VOFF (V) RTOP (kΩ)(1) RBOTTOM (kΩ)(1)
1 2.970 0.330 110.0 27.8
2 1.350 0.150 50.0 39.9
3 0.720 0.080 26.7 132.0
4 0.792 0.088 29.3 91.0
(1) Values are rounded to one decimal place.

An example of how the top and bottom resistors for channel 1 (or SENSE1) were calculated are shown below:

Equation 31. 2.970   V -   0.330   V 24   μ A   =   110   k Ω  
Equation 32. 110   k Ω × 0.599   V 2.970   V   -   0.599   V   =   39.88   k Ω
Table 8-3 SENSEx Selected Resistors Using 0.1 % Tolerance Resistors
Channel # RTOP (kΩ) RBOTTOM (kΩ)
1 110 27.7
2 49.9 40.2
3 26.7 130
4 29.4 90.9

Now that the actual resistors are known, we can calculate the actual on and off nominal voltages and the error voltages by using Equation 1, Equation 2, Equation 3, Equation 6, Equation 7, and Equation 12. Using the errors, we can calculate the upper and lower voltages and normalize the values with respect to the nominal output voltage.

Table 8-4 VON Nominal Values With Statistics in Volts and Percentage
Channel # VON_NOMINAL (V)(1) VON_NOMINAL (%)(1)(4) VON_ERROR (mV)(1) VON_LSL (V)(1)(2) VON_LSL (%)(1)(2)(4) VON_USL (V)(1)(3) VON_USL (%)(1)(3) (4)
1 2.978 90.232 29.966 2.948 89.325 3.008 91.141
2 1.343 89.502 13.466 1.329 88.605 1.356 90.400
3 0.722 90.253 7.222 0.715 89.350 0.729 91.156
4 0.793 90.084 7.932 0.785 89.182 0.801 90.985
(1) Values are rounded to three decimal places.
(2) LSL stands for lower specification limit or the min.
(3) USL stands for upper specification limit or the max.
(4) Values are normalized to the nominal output voltage for that rail.
Table 8-5 VOFF Nominal Values with Statistics in Volts and Percentage
Channel # VOFF_NOMINAL (V)(1) VOFF_NOMINAL (%)(1)(4) VOFF_ERROR (mV)(1) VOFF_LSL (V)(1)(2) VOFF_LSL (%)(1)(2)(4) VOFF_USL (V)(1)(3) VOFF_USL (%)(1)(3) (4)
1 0.338 10.233 84.613 0.253 7.669 0.422 12.797
2 0.145 9.662 38.354 0.107 7.105 0.183 12.219
3 0.081 10.153 20.535 0.061 7.586 0.102 12.720
4 0.087 9.902 22.604 0.065 7.333 0.110 12.470
(1) Values are rounded to three decimal places.
(2) LSL stands for lower specification limit.
(3) USL stands for upper specification limit.
(4) Values are normalized to the nominal output voltage for that rail.