ZHCSKS6B June 2020 – August 2024 AMC3330
PRODUCTION DATA
Use Ohm's Law to calculate the minimum total resistance of the resistive divider to limit the cross current to the desired value ( RTOTAL = VLx / ICROSS) and the required sense resistor value to be connected to the AMC3330 input: RSNS = VFSR / ICROSS.
Consider the following two restrictions to choose the proper value of the sense resistor RSNS:
Table 7-2 lists examples of nominal E96-series (1% accuracy) resistor values for systems
using 120-V and
230-V AC line voltages.
| PARAMETER | 120-VRMS LINE VOLTAGE | 230-VRMS LINE VOLTAGE |
|---|---|---|
| Peak voltage | 170 V | 325 V |
| Resistive divider resistors RL11, RL12 | 845 kΩ | 1.62 MΩ |
| Sense resistor RSNS | 10 kΩ | 10 kΩ |
| Current through resistive divider ICROSS | 100 μA | 100 μA |
| Resulting voltage drop on sense resistor VSNS | 1.00 V | 1.00 V |