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| 型號(hào)： | RP504K291D-E2 |
| 廠商： | RICOH COMPANY LTD |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.9 A SWITCHING CONTROLLER, 2550 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封裝： | 1.20 X 1.60 MM, HALOGEN FREE AND ROHS COMPLIANT, DFN-6 |
| 文件頁(yè)數(shù)： | 5/29頁(yè) |
| 文件大?。?/td> | 996K |
| 代理商： | RP504K291D-E2 |
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RP504x
13
Output Current and selection of External components
The relation between the output current and external components is as follows:
(Wherein, Ripple Current p-p value is described as IRP, ON resistance of Pch Tr. and Nch Tr. of LX are
respectively described as RONP and RONN, and the DC resistor of the inductor is described as RL.)
When Pch Tr. of LX is ON:
VIN = VOUT + (RONP + RL)
× IOUT + L × IRP / ton ................................................................. Equation 3
When Pch Tr. of LX is "OFF" (Nch Tr. is "ON"):
L
× IRP / toff = RONN × IOUT + VOUT + RL × IOUT ................................................................. Equation 4
Put Equation 4 to Equation 3 and solve for ON duty of Pch 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:
ILXmax = IOUT + IRP / 2 .................................................................................................... Equation 7
Consider ILXmax, 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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