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It is said that NCP1294 is voltage mode controller. But I understood that NCP1294 can also be operated in current mode. According to the reference design "DN06054/D - Reference Design for Solar Power MPPT Controller" and application note: 'AND8490/D', it is being operated in current mode. My question is, when the controller is operating in current mode cotrol, don't we have to do the solpe compensation? And is it true that, NCP1294 can be operated in both voltage mode as well as current mode controller?

You can place the RTCT configuration on top of the Current sense resistor for the main switch which injects a current signal into the ramp. You can then adjust the slope compensation via the Input voltage feed forward. The application in the MPPT is operating in a constant power topology and is not exactly current mode but rather current tracked and limited via voltage feedback. Answered by:
ON Semiconductor
2013-03-15 09:48:24.146