Datasheet > RP500N131A-TR

RP500N131A-TR

更新时间： 2023-08-15 00:00:00

品牌	Logo	应用领域
理光 - RICOH		光电二极管
页数	文件大小	规格书
22页	472K
描述
Switching Regulator, 0.9A, 1440kHz Switching Freq-Max, CMOS, PDSO6, SOT-23, 6 PIN

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RP500N131A-TR 数据手册

RP500X

OUTPUT CURRENT AND SELECTION OF EXTERNAL COMPONENTS

The relation between the output current and external components is as follows:

When P-channel Tr. of L^Xis 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) x IOUT + L x IRP / ton ......................................................... Equation 1

When P-channel Tr. of L^Xis "OFF"(N-channel Tr. is "ON"):

L x IRP / toff = RONN x IOUT + VOUT + RL x IOUT ......................................................... Equation 2

Put Equation 2 to Equation 1 and solve for ON duty of P-channel transistor, ton/(toff + ton) = DON,

DON = (VOUT + RONN x IOUT + RL x IOUT) / (VIN + RONN x IOUT – RONP x IOUT).......... Equation 3

Ripple Current is as follows:

IRP = (VIN – VOUT – RONP x IOUT – RL x IOUT) x DON / fosc / L................................... Equation 4

wherein, peak current that flows through L, and LX Tr. is as follows:

ILmax = IOUT + IRP / 2.................................................................................................. Equation 5

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.

1...5 6 789 10 11...22

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