User guide
40 of 45
V 1.0.1
2021-01-27
REF-AIRCON-C302A-IM564 user guide
Air conditioner application reference design kits
System performance
4.5
DC bus sensing and overvoltage protection
Figure 35 provides the DC bus sense resistor details on the REF-AIRCON-C302A-IM564 reference design.
The high-side resistor is 1880 kOhm and the low-side resistor is 20 kΩ; 0 ~ 475 V DCBUS reflecting 0 ~ 5 V at the
ADC input pin.
Figure 35
DC bus sense resistor on REF-AIRCON-C302A-IM564 reference design
For a different DC sensing range such as 110 V applications, R68 can be adjusted to a higher value; the hardware
changes should be configured in MCEWizard, as shown in Figure 36.
Figure 36
DC bus sensing configuration in MCEWizard
