ZHCSQM2 May   2022 AMC1333M10

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  Power Ratings
    6. 6.6  Insulation Specifications
    7. 6.7  Safety-Related Certifications
    8. 6.8  Safety Limiting Values
    9. 6.9  Electrical Characteristics
    10. 6.10 Switching Characteristics
    11. 6.11 Timing Diagrams
    12. 6.12 Insulation Characteristics Curves
    13. 6.13 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 Analog Input
      2. 7.3.2 Modulator
      3. 7.3.3 Isolation Channel Signal Transmission
      4. 7.3.4 Digital Output
        1. 7.3.4.1 Output Behavior in Case of a Full-Scale Input
        2. 7.3.4.2 Output Behavior in Case of a Missing High-Side Supply
    4. 7.4 Device Functional Modes
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Input Filter Design
        2. 8.2.2.2 Bitstream Filtering
      3. 8.2.3 Application Curve
    3. 8.3 What to Do and What Not to Do
  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 Detailed Design Procedure

This discussion covers the 230-VRMS example. The procedure for calculating the resistive divider for the 120-VRMS use case is identical.

The 100-μA, cross-current requirement at peak input voltage (360 V) determines that the total impedance of the resistive divider is 3.6 MΩ. The impedance of the resistive divider is dominated by the top resistors (shown exemplary as R1 and R2 in Figure 8-1) and the voltage drop across RSNS can be neglected for a short time. The maximum allowed voltage drop per unit resistor is specified as 75 V; therefore, the total minimum number of unit resistors in the top portion of the resistive divider is 360 V / 75 V = 5. The calculated unit value is 3.6 MΩ / 5 = 720 kΩ, and the next closest value from the E96 series is 715 kΩ.

The sense resistor value RSNS is sized such that the voltage drop across the impedance at maximum input voltage (360 V) equals the linear full-scale input voltage (VFSR) of the AMC1333M10 (that is, +1 V). RSNS is calculated as RSNS = VFSR / (VPeak – VFSR) × RTOP, where RTOP is the total value of the top resistor string (5 × 715 kΩ = 3575 kΩ). The resulting value for RSNS is 10.04 kΩ, and the next closest value from the E96 series is 10.0 kΩ.

Table 8-2 summarizes the design of the resistive divider.

Table 8-2 Resistor Value Examples
PARAMETER 120-VRMS LINE VOLTAGE 230-VRMS LINE VOLTAGE
Peak voltage 190 V 360 V
Unit resistor value, RTOP 634 kΩ 715 kΩ
Number of unit resistors in RTOP 3 5
Sense resistor value, RSNS 10.2kΩ 10.0 kΩ
Total resistance value (RTOP + RSNS) 1912.2 kΩ 3885.0 kΩ
Resulting current through resistive divider, ICROSS 99.4 μA 100.4 μA
Resulting full-scale voltage drop across sense resistor RSNS 1.013 V 1.004 V
Peak power dissipated in RTOP unit resistor 6.3 mW 7.2 mW
Total peak power dissipated in resistive divider 18.9 mW 36.2 mW