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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)： | 42/42頁 |
| 文件大?。?/td> | 399K |
| 代理商： | R1224N312M-TR-F |
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R1224N
9
How to Adjust Output Voltage and about Phase Compensation
As for Adjustable Output type, feedback pin (VFB) voltage is controlled to maintain 1.0V.
Output Voltage, VOUT is as following equation:
VOUT: R2
+R4=VFB: R2
VOUT
=VFB×(R2+R4)/R2
Thus, with changing the value of R2 and R4, output voltage can be set in the specified range.
In the DC/DC converter, with the load current and external components such as L and C, phase might be behind
180 degree. In this case, the phase margin of the system will be less and stability will be worse. To prevent this,
phase margin should be secured with proceeding the phase. A pole is formed with external components L and
C3.
C3
L
1/2
~
Fpole
×
π
A zero (signal back to zero) is formed with R4 and C4.
Fzero~1/(2π×R4×C4)
For example, if L
=27H, C3=47F, the cut off frequency of the pole is approximately 4.5kHz.
To make the cut off frequency of the pole as much as 4.5kHz, set R4
=33k and C4=1000pF.
If VOUT is set at 2.5V, R2
=22k is appropriate.
R3 prevents feedback of the noise to VFB pin, about 2.7k
is appropriate value.
CE CONTROL
C3
L
LOAD
C1
R1
C2
PMOS
SD
C4
R3
R4
R2
R1224N
EXT
GND
VFB
VIN
CE
5
1
2
3
4
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