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INA223: Circuit concept for constant load power using TPS62130A

Part Number: INA223
Other Parts Discussed in Thread: TPS62130A,

As mentioned in the other thread, I was aiming to use the INA223 to adjust the TPS62130A output voltage so that a constant power is delivered to a load resistance. I believe I have achieved that, and would appreciate a review of my design to make sure that I can believe the results. 

Across Monte Carlo and Worst Case simulations I was seeing about 0.08% variation in output power, which seems too good. Is there anything else I should be adding/testing to make sure that my results are believable? Attached is the PSpice schematic that I have created for this circuit.

Thanks,
Drew

INA223_const_pow.zip