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参数资料
| 型号： | RP502L081B-TR |
| 厂商： | RICOH COMPANY LTD |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING REGULATOR, 3960 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封装： | 1.60 X 1.60 MM, HALOGEN FREE AND ROHS COMPLIANT, DFN-6 |
| 文件页数： | 6/30页 |
| 文件大小： | 1222K |
| 代理商： | RP502L081B-TR |
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RP502x
14
Output Current and selection of External components
The relation between the output current and external components is as follows:
When Pch Tr. of LX is turned on:
(Ripple Current p-p value is described as IRP, On Resistances of Pch Tr. and Nch Tr. are respectively described
as RONP and RONN. Also, the DC resistor of the inductor is described as RL.)
The time period of LX Pch Tr. being “ON” is described as ton.
VIN = VOUT + (RONP + RL) x IOUT + L x IRP / ton ...............................................................Equation 3
The time period of Lx Pch Tr. being "OFF" is described as toff. (Nch Tr. is "ON"):
L x IRP / toff = RONN x IOUT + VOUT + RL x IOUT .............................................................Equation 4
Substitute Equation 4 into Equation 3 to solve for ON duty of Pch Tr.: (DON = ton / (toff + ton).
DON = (VOUT + RONN x IOUT + RL x IOUT) / (VIN + RONN x IOUT – RONP x IOUT) ....................Equation 5
Ripple Current is solved by the following equation:
IRP = (VIN – VOUT – RONP x IOUT – RL x IOUT) x DON / fosc / L ..........................................Equation 6
Wherein, peak current that flows through L and LX Tr. is solved by the following equation:
ILxmax = IOUT + IRP / 2...................................................................................................Equation 7
It is necessary to consider ILxmax when deciding the input/output conditions and selecting the peripheral
components.
The above calculation is based on the ideal operation of the ICs in continuous mode.
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