Other Parts Discussed in Thread: UCC3818, UCC28070
CURRENT ERROR AMPLIFIER
This error amplifier configuration conventionally has a resistor from the inverting input to common, and a resistor from the multiplier output to a negative current sense voltage. The negative current sense voltage is from a current sense resistor or from a current transformer circuit such as in DN-39E (slua172) Figure 3.
Instead of this configuration, can the multiplier resistor be tied to common, and the inverting input connected to a positive current sense signal?
The data sheet says that it has a CMRR Common mode rejection range of -0.3V to 5.0V. Is this referring to the amplifier inputs? If so, could not a positive current sense signal in that range be applied?
With this not being a transconductance amplifier and having a short circuit current of 1.5 to 3.5A, it looks like there is no way to bypass this amplifier with an external one.