ZHCSM86E october   2020  – august 2023 TPS37

PRODUCTION DATA  

  1.   1
  2. 特性
  3. 应用
  4. 说明
  5. Revision History
  6. Device Comparison
  7. Pin Configuration and Functions
  8. 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 Timing Requirements
    7. 7.7 Timing Diagrams
    8. 7.8 Typical Characteristics
  9. Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Input Voltage (VDD)
        1. 8.3.1.1 Undervoltage Lockout (VPOR < VDD < UVLO)
        2. 8.3.1.2 Power-On Reset (VDD < VPOR )
      2. 8.3.2 SENSE
        1. 8.3.2.1 SENSE Hysteresis
      3. 8.3.3 Output Logic Configurations
        1. 8.3.3.1 Open-Drain
        2. 8.3.3.2 Push-Pull
        3. 8.3.3.3 Active-High (RESET)
        4. 8.3.3.4 Active-Low (RESET)
      4. 8.3.4 User-Programmable Reset Time Delay
        1. 8.3.4.1 Reset Time Delay Configuration
      5. 8.3.5 User-Programmable Sense Delay
        1. 8.3.5.1 Sense Time Delay Configuration
      6. 8.3.6 Manual RESET (CTR1 / MR) and (CTR2 / MR) Input
  10. Device Functional Modes
  11. 10Application and Implementation
    1. 10.1 Adjustable Voltage Thresholds
      1. 10.1.1 Application Curves
    2. 10.2 Application Information
      1. 10.2.1 Typical Application
        1. 10.2.1.1 Design 1: High Voltage – Fast AC Signal Monitoring For Power Fault Detection
          1. 10.2.1.1.1 Design Requirements
          2. 10.2.1.1.2 Detailed Design Procedure
    3. 10.3 Power Supply Recommendations
      1. 10.3.1 Power Dissipation and Device Operation
    4. 10.4 Layout
      1. 10.4.1 Layout Guidelines
      2. 10.4.2 Layout Example
      3. 10.4.3 Creepage Distance
  12. 11Device and Documentation Support
    1. 11.1 Device Nomenclature
    2. 11.2 支持资源
    3. 11.3 Trademarks
    4. 11.4 静电放电警告
    5. 11.5 术语表

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

SENSE Hysteresis

Built-in hysteresis to avoid erroneous output reset release. The hysteresis is opposite to the threshold voltage; for overvoltage options the hysteresis is subtracted from the positive threshold (VITP), for undervoltage options hysteresis is added to the negative threshold (VITN).

GUID-20200819-CA0I-SBQM-CC4P-F9SF3V4TNH0P-low.gifFigure 8-4 Hysteresis (Overvoltage Active-Low)
GUID-20200819-CA0I-RLTT-BDP1-NTJWPJBD6W9T-low.gifFigure 8-6 Hysteresis (Undervoltage Active-High)
GUID-20200819-CA0I-JRJW-KDX8-FSS17LCPFF2V-low.gifFigure 8-5 Hysteresis (Overvoltage Active-High)
GUID-20200819-CA0I-WK8H-XNTM-PCK0BKLBVN67-low.gifFigure 8-7 Hysteresis (Undervoltage Active-Low)
Table 8-1 Common Hysteresis Lookup Table
TARGET DEVICE ACTUAL HYSTERESIS OPTION
DETECT THRESHOLD TOPOLOGY RELEASE VOLTAGE (V)
18.0 V Overvoltage 17.5 V -3%
18.0 V Overvoltage 16.0 V -11%
17.0 V Overvoltage 16.5 V -3%
16.0 V Overvoltage 15.0 V -6%
15.0 V Overvoltage 14.0 V -7%
6.0 V Undervoltage 6.5 V 0.5 V
5.5 V Undervoltage 6 V 0.5 V
8 V Undervoltage 9 V 1 V
5 V Undervoltage 7.5 V 2.5 V

Table 8-1 shows a sample of hysteresis and voltage options for the TPS37. For threshold voltages ranging from 2.7 V to 8 V, one option is to select a fixed hysteresis value ranging from 0.5 V to 2.5 V in increments of
0.5 V. Additionally, a second option can be selected where the hysteresis value is a percentage of the threshold voltage. The percentage of voltage hysteresis ranges from 2% to 13%.

Knowing the amount of hysteresis voltage, the release voltage for the undervoltage (UV) channel is
(VITN(UV) + VHYS) and for the overvoltage (OV) channel is (VITP(OV) - VHYS). For a visual understanding of the UV and OV release voltage, see SENSEx Undervoltage (UV) Timing Diagram and SENSEx Overvoltage (OV) Timing Diagram. The accuracy of the release voltage, or stated in the Section 7.5 as Hysteresis Accuracy is ±1.5%. Expanding what is shown in Table 8-1, below are a few voltage hysteresis examples that include the hysteresis accuracy:

Undervoltage (UV) Channel

VITN = 0.8 V

Voltage Hysteresis (VHYS) = 5% = 40 mV

Hysteresis Accuracy = ±1.5% = 39.4 mV or 40.6 mV

Release Voltage = VITN + VHYS = 839.4 mV to 840.6 mV

Overvoltage (OV) Channel

VITP = 8 V

Voltage Hysteresis (VHYS) = 2 V

Hysteresis Accuracy = ±1.5% = 1.97 V or 2.03 V

Release Voltage = VITP - VHYS = 5.97 V to 6.03 V