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R5220D221A Datasheet(PDF) 8 Page - RICOH electronics devices division |
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R5220D221A Datasheet(HTML) 8 Page - RICOH electronics devices division |
8 / 25 page R5220x 8 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 2 When P-channel Tr. of LX is "OFF"(N-channel Tr. is "ON"): L × IRP / toff = RONN × IOUT + VOUT + RL × IOUT ..................................................................Equation 3 Put Equation 3 to Equation 2 and solve for ON duty of P-channel transistor, ton/(toff +ton)=DON, DON = (VOUT – RONN × IOUT + RL × IOUT) / (VIN + RONN × IOUT – RONP × IOUT)............................Equation 4 Ripple Current is as follows; IRP = (VIN − VOUT − RONP × IOUT − RL × IOUT) × DON / fosc / L................................................Equation 5 wherein, peak current that flows through L, and LX Tr. is as follows; ILmax = IOUT + IRP / 2 ......................................................................................................Equation 6 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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