8.2.2 IGBT Temperature Sensing

The high input impedance of the AMC1035 is optimized for usage in voltage-sensing applications. Additionally, the internal voltage reference supports temperature sensing using a positive temperature coefficient (PTC) or a negative temperature coefficient (NTC) sensor often integrated in the IGBT module.

The same reference is internally used by the modulator, resulting in a ratiometric system solution that minimizes the overall temperature drift of the sensing path. Figure 47 shows a simplified schematic of the AMC1035 used for temperature sensing of the IGBT module.

Figure 47. Using the AMC1035 for Temperature Sensing