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參數(shù)資料
| 型號： | R5220D281B-TR-F |
| 廠商： | RICOH COMPANY LTD |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.8 A SWITCHING REGULATOR, 1440 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封裝： | LEAD FREE, SON-6 |
| 文件頁數(shù)： | 24/25頁 |
| 文件大?。?/td> | 521K |
| 代理商： | R5220D281B-TR-F |
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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