SBAS654G June 2014 – January 2020 AMC1305L25 , AMC1305M05 , AMC1305M25
PRODUCTION DATA.
A typical operation of the device in a frequency inverter application is shown in Figure 54. When the inverter stage is part of a motor drive system, measurement of the motor phase current is done via the shunt resistors (RSHUNT). Depending on the system design, either all three or only two phase currents are sensed.
In this example, an additional fourth AMC1305 is used to support isolated voltage sensing of the dc link. This high voltage is reduced using a high-impedance resistive divider before being sensed by the device across a smaller resistor. The value of this resistor can degrade the performance of the measurement, as described in the Isolated Voltage Sensing section.