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R5220D261A Datasheet(PDF) 8 Page - RICOH electronics devices division

Part # R5220D261A
Description  PWM Step-down DC/DC Converter with switch function
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Manufacturer  RICOH [RICOH electronics devices division]
Direct Link  http://www.ricoh.com
Logo RICOH - RICOH electronics devices division

R5220D261A Datasheet(HTML) 8 Page - RICOH electronics devices division

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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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