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If Equ. 169 is 70mV/us, then the Equ. 170 become a negative value (67-70)=-3mV/us. So that Equ. 171 also become a negative resistance 2.5/(0.5x-3x0.001)=-1.7kohm.
May I know how to design this negative resistance?
In addition, may I know its reasonable for the Equ. 170 become a negative?
That would indicate the magnetizing inductance added enough slope compensation and none is needed. In that case I would still add 100 to 200 mV of slope compensation just to ensure at light load the PWM comparator had a signal to control to because the CS signal is so small at light loads.
