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参数资料
| 型号： | R5220D321B-TR |
| 厂商： | RICOH COMPANY LTD |
| 元件分类： | 稳压器 |
| 英文描述： | 0.8 A SWITCHING REGULATOR, 1440 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封装： | 0.85 MM HEIGHT, TSON-6 |
| 文件页数： | 21/22页 |
| 文件大小： | 627K |
| 代理商： | R5220D321B-TR |
R5220D
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 3
When P-channel Tr. of LX is "OFF"(N-channel Tr. is "ON"):
L
×IRP/toff= RL×IOUT+VOUT+RONN×IOUT ...............................................................................Equation 4
Put Equation 4 to Equation 3 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 5
Ripple Current is as follows;
IRP
=(VINVOUTRONP×IOUTRL×IOUT)×DON/f/L ....................................................................Equation 6
wherein, peak current that flows through L, and LX Tr. 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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