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R1224N252E Datasheet(PDF) 11 Page - RICOH electronics devices division |
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R1224N252E Datasheet(HTML) 11 Page - RICOH electronics devices division |
11 / 42 page R1224N In the continuous mode, when Equation 1 is solved for ton and assumed that the solution is tonc, tonc =T×VOUT/VIN..................................................................................... Equation 2 When ton<tonc, the mode is the discontinuous mode, and when ton =tonc, the mode is the continuous mode. OUTPUT CURRENT AND SELECTION OF EXTERNAL COMPONENTS When Lx Tr. is ON: (Wherein, Ripple Current P-P value is described as IRP, ON resistance of Lx Tr. is described as Rp the direct current of the inductor is described as RL.) VIN =VOUT+(Rp+RL)×IOUT+L×IRP/ton .................................................Equation 3 When Lx Tr. is OFF: L ×IRP/toff=VF+VOUT+RL×IOUT ............................................................ Equation 4 Put Equation 4 to Equation 3 and solve for ON duty, ton/(toff+ton) =DON, DON =(VOUT+VF+RL×IOUT)/(VIN+VF−Rp×IOUT)......................................Equation 5 Ripple Current is as follows; IRP =(VIN−VOUT−Rp×IOUT−RL×IOUT)×DON/f/L........................................Equation 6 Wherein, peak current that flows through L, Lx Tr., and SD is as follows; ILmax =IOUT+IRP/2............................................................................ Equation 7 Consider ILmax, condition of input and output and select external components. The above explanation is directed to the calculation in an ideal case in continuous mode. 11 |
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