Multiplier at INV input of the Current Error Amp

Question

Hello, 
 In the block diagram on page 8 of the datasheet, there is a multiplier labeled "1.25 x (1-D)" connected to 
 the inverting input of the CURRENT ERROR AMP. Could you please explain the reason for this operation and the formula? 
 Thanks,

Satoru · Accepted Answer

Hello Normal21, 1.25x(1-D) is part of the internal equation that calculates the output current according to the duty cycle and the Vc voltage. Those equations are based off of the duty cycle, and peak Vsense to calculate the Iout. Basically, it will pull down Vc (which is related to Isense cycle by cycle peak current) when it is calculated that Iout is over the CC limit set by IREG. Regards,)

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Multiplier at INV input of the Current Error Amp

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