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參數(shù)資料
| 型號： | R1224N312M-TR-F |
| 廠商： | RICOH COMPANY LTD |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.05 A SWITCHING CONTROLLER, 216 kHz SWITCHING FREQ-MAX, PDSO5 |
| 封裝： | LEAD FREE, SOT-23, 5 PIN |
| 文件頁數(shù)： | 3/42頁 |
| 文件大小： | 399K |
| 代理商： | R1224N312M-TR-F |
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R1224N
11
In the continuous mode, when Equation 1 is solved for ton and assumed that the solution is tonc,
tonc
=T×VOUT/VIN..................................................................................... Equation 2
When ton<tonc, the mode is the discontinuous mode, and when ton
=tonc, the mode is the continuous mode.
OUTPUT CURRENT AND SELECTION OF EXTERNAL COMPONENTS
When Lx Tr. is ON:
(Wherein, Ripple Current P-P value is described as IRP, ON resistance of Lx Tr. is described as Rp the direct
current of the inductor is described as RL.)
VIN
=VOUT+(Rp+RL)×IOUT+L×IRP/ton .................................................Equation 3
When Lx Tr. is OFF:
L
×IRP/toff=VF+VOUT+RL×IOUT ............................................................ Equation 4
Put Equation 4 to Equation 3 and solve for ON duty, ton/(toff+ton)
=DON,
DON
=(VOUT+VF+RL×IOUT)/(VIN+VFRp×IOUT)......................................Equation 5
Ripple Current is as follows;
IRP
=(VINVOUTRp×IOUTRL×IOUT)×DON/f/L........................................Equation 6
Wherein, peak current that flows through L, Lx Tr., and SD is as follows;
ILmax
=IOUT+IRP/2............................................................................ Equation 7
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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