ZHCSJP5B May   2019  – October 2021 ALM2402F-Q1

PRODUCTION DATA  

  1. 1 特性
  2. 2 应用
  3. 3 说明
  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: VS = 12 V
    6. 6.6 Electrical Characteristics: VS = 5 V
    7. 6.7 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 OTF/SH_DN
      2. 7.3.2 Output Stage Supply Voltage
      3. 7.3.3 Current-Limit and Short-Circuit Protection
      4. 7.3.4 Input Common-Mode Overvoltage Clamps
      5. 7.3.5 Thermal Shutdown
      6. 7.3.6 Output Stage
      7. 7.3.7 EMI Susceptibility and Input Filtering
    4. 7.4 Device Functional Modes
      1. 7.4.1 Open-Loop and Closed-Loop Operation
      2. 7.4.2 Shutdown
  8. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Capacitive Load and Stability
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Resolver Excitation Input (Op Amp Output)
          1. 8.2.2.1.1 Excitation Voltage
          2. 8.2.2.1.2 Excitation Frequency
          3. 8.2.2.1.3 Excitation Impedance
        2. 8.2.2.2 Resolver Output
        3. 8.2.2.3 Power Dissipation and Thermal Reliability
          1. 8.2.2.3.1 Improving Package Thermal Performance
      3. 8.2.3 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 Documentation Support
      1. 11.1.1 Related Documentation
    2. 11.2 接收文档更新通知
    3. 11.3 支持资源
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 术语表
  12. 12Mechanical, Packaging, and Orderable Information

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7.3.1 OTF/SH_DN

The overtemperature and shutdown (OTF/SH_DN) pin is a bidirectional pin that allows both op amps to be put into a low IQ state (~500 µA) when forced low or less than VIL_OTF. As a result of this pin being bidirectional, and the respective enable and disable functionality, this pin must be pulled high or greater than VIH_OTF through a pullup resistor; see the Electrical Characteristics table.

When the junction temperature of ALM2402F-Q1 exceeds the limits specified in the Recommended Operating Conditions table, the OTF/SH_DN pin goes low to alert the application that both the outputs have turned off because of an overtemperature event. Also, the OTF pin goes low if VS_O1 and VS_O2 are 0 V. In case of an overtemperature event, the op amps are shut down even if OTF/SH_DN is forced high.

When OTF/SH_DN is pulled low and the op amps are shut down, the op amps are in an open loop, even when there is negative feedback applied. This occurrence is due to the loss of the open-loop gain in the op amps when the biasing is disabled. See Section 7.4.1 for more details on open- and closed-loop considerations.
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