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define k_feed_forward

johnliang
Intellectual 505 points

#define k_feed_forward ((uint32)(0.5*VAC_MIN_OFF*1.414*VAC_VOLTAGE_DIVIDER*0x7FFFFFFF)//Q30

above code was the UCD3138-026 EVM

what's the meaning of the code"0x7FFFFFFF"?  WHY?