SDAA249 January   2026 AMC3330-Q1 , INA148-Q1 , TPS61170-Q1 , TPSI2240-Q1

1.   1
2.   Abstract
3.   Trademarks
4. 1Introduction
   1. 1.1 Background
   2. 1.2 Operation Principle
5. 2Hardware Design
   1. 2.1 Solid State Relay (SSR)
   2. 2.2 Resistors
      1. 2.2.1 Minimum Resistance
      2. 2.2.2 Maximum Resistance
      3. 2.2.3 Resistance Ratio
   3. 2.3 Bias Supply
   4. 2.4 Amplifier
      1. 2.4.1 MCU on the Low Voltage Side
      2. 2.4.2 MCU on the AC Side
6. 3Software Design
   1. 3.1 Settling Time
   2. 3.2 SSR Sequence
   3. 3.3 Voltage Threshold
   4. 3.4 Moving Average
   5. 3.5 Plausibility Check
   6. 3.6 Control Scheme Summary
7. 4Simulation Results
   1. 4.1 Settling Time
   2. 4.2 Input Voltage Range
   3. 4.3 Plausibility Check
   4. 4.4 Accuracy
   5. 4.5 Influence of the Y Capacitor
8. 5Summary
9. 6References