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R1232D301A Datasheet(PDF) 11 Page - RICOH electronics devices division |
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R1232D301A Datasheet(HTML) 11 Page - RICOH electronics devices division |
11 / 24 page R1232D 11 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 the ton =tonc, the mode is the continuous mode. OUTPUT CURRENT AND SELECTION OF EXTERNAL COMPONENTS When P-channel Tr. of LX is ON: (Wherein, Ripple Current P-P value is described as IRP, ON resistance of P-channel Tr. and N-channel Tr. of LX are respectively described as RONP and RONN, and the DC resistor of the inductor is described as RL.) VIN =VOUT+(RONP+RL)×IOUT+L×IRP/ton .............................................................................. Equation 3 When P-channel Tr. of LX is "OFF"(N-channel Tr. is "ON"): L ×IRP/toff=VF+VOUT+RONN×IOUT ....................................................................................... Equation 4 Put Equation 4 to Equation 3 and solve for ON duty of P-channel transistor, Don =ton/(toff+ton), DON =(VOUT−RONN×IOUT+RL×IOUT)/(VIN+RONN×IOUT−RONP×IOUT) ........................................... Equation 5 Ripple Current is as follows; IRP =(VIN−VOUT−RONP×IOUT−RL×IOUT)×DON/fosc/L .............................................................. Equation 6 wherein, peak current that flows through L, and LX Tr. 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. |
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