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參數(shù)資料
| 型號(hào)： | R1232D271A-TR |
| 廠商： | RICOH COMPANY LTD |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1.5 A SWITCHING REGULATOR, 1250 kHz SWITCHING FREQ-MAX, DSO8 |
| 封裝： | 0.90 MM HEIGHT, SON-8 |
| 文件頁數(shù)： | 4/24頁 |
| 文件大?。?/td> | 883K |
| 代理商： | R1232D271A-TR |
R1232D
12
How to Adjust Output Voltage and about Phase Compensation
As for Adjustable Output type, feedback pin (VFB) voltage is controlled to maintain 0.8V.
Output Voltage, VOUT is as following equation;
VOUT R1
+R2=VFB:R2
VOUT
=VFB×(R1+R2)/R2
Thus, with changing the value of R1 and R2, 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 COUT.
OUT
LC
1/2
~
fpole
π
A zero (signal back to zero) is formed with R1 and Cb.
fzero ~ 1/(2p×R1×Cb)
First, choose the appropriate value of R1, R2 and Cb.
Set R1
+R2 value 100k or less.
For example, if L
=4.7H, COUT =10F, the cut off frequency of the pole is approximately 23kHz.
To make the cut off frequency of the zero by R1, R2, and Cb be higher than 23kHz,
set R1
=33k and Cb=100pF.If VOUT is set at 2.0V, R2 = 22k is appropriate.
External Components
1.Inductor
Select an inductor that peak current does not exceed ILmax. If larger current than allowable current flows,
magnetic saturation occurs and makes transform efficiency be worse.
Supposed that the load current is at the same, the smaller value of L is used, the larger the ripple current is.
Provided that the allowable current is large in that case and DC current is small, therefore, for large output
current, efficiency is better than using an inductor with a large value of L and vice versa.
2.Capacitor
As for CIN, use a capacitor with low ESR (Equivalent Series Resistance) Ceramic type of a capacity at least
10
F for stable operation.
COUT can reduce ripple of Output Voltage, therefore as much as 10
F ceramic type is recommended.
3.Diode
If VFM mode is chosen at light load, use a Schottky diode with small VF. A diode with small VF makes the
efficiency of the circuit improved. Small reverse direction current, IR is an important factor, however, VF has more
important priority than IR.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| R1232D271B | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:PWM STEP-DOWN DC/DC CONVERTER WITH SYNCHRONOUS RECTIFIER |
| R1232D281A | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:PWM STEP-DOWN DC/DC CONVERTER WITH SYNCHRONOUS RECTIFIER |
| R1232D281B | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:PWM STEP-DOWN DC/DC CONVERTER WITH SYNCHRONOUS RECTIFIER |
| R1232D291A | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:PWM STEP-DOWN DC/DC CONVERTER WITH SYNCHRONOUS RECTIFIER |
| R1232D291B | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:PWM STEP-DOWN DC/DC CONVERTER WITH SYNCHRONOUS RECTIFIER |
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