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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8.2.2.1.1 Excitation Voltage

The resolver primary winding or excitation coil can be driven by a single-ended op amp output with the other side of the coil grounded, or differentially as shown in Figure 8-2. A differential drive offers higher voltage (double) on to the excitation coil, while not using as much output voltage headroom from the op amp. This larger output voltage due to the differential drive leads to lower distortion on the output signal.

For this example, the resolver impedance is specified from 2 VRMS and 7 VRMS up to 20-kHz maximum frequency. To highlight use with a 7 VRMS resolver, an excitation voltage of 10 VPP is applied from each channel of the ALM2402F-Q1. The op amp is set in an inverting gain = –2 V/V, while applying an adequate common-mode bias. These conditions give the required 7 VRMS differential output (3.5 VRMS per each op amp channel) to the resolver primary winding without running into any op-amp headroom issues.

Another consideration for excitation is op-amp power dissipation. As described in the Power Dissipation and Thermal Reliability section, power dissipation from the op amp can be lowered by driving the output peak voltages close to the supply and ground voltages. With the very low VOH/VOL of the ALM2402F-Q1, lower power dissipation is easily accomplished. See the Output Stage section for a further description of the rail-rail output stage.