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UC1843B-SP: External error amplifier to override internal error amplifier

Part Number: UC1843B-SP
Other Parts Discussed in Thread: UC1843-SP

I am using the UC1843-SP in an application where the error amplifier reference needs to be variable, so I am wondering what is the best way to override the internal error amplifier but also stay within the ratings of the VFB and COMP pins.  Any suggestions?