參數(shù)資料
型號(hào)： R1232D151B
廠商： Ricoh Co., Ltd.
英文描述： PWM STEP-DOWN DC/DC CONVERTER WITH SYNCHRONOUS RECTIFIER
中文描述： PWM降壓型DC / DC變換器的同步整流
文件頁(yè)數(shù)： 12/24頁(yè)
文件大小： 819K
代理商： R1232D151B
R1232D
How to Adjust Output Voltage and about Phase Compensation
12
As for Adjustable Output type, feedback pin (V
FB
) voltage is controlled to maintain 0.8V.
Output Voltage, V
OUT
is as following equation;
V
OUT
R1
+
R2
=
V
FB
:R2
V
OUT
=
V
FB
×
(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 C
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
=
4.7
μ
H, C
OUT
=
10
μ
F, 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 V
OUT
is set at 2.0V, R2
=
22k
is appropriate.
OUT
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
R1232D161A 制造商:RICOH 制造商全稱(chēng):RICOH electronics devices division 功能描述:PWM STEP-DOWN DC/DC CONVERTER WITH SYNCHRONOUS RECTIFIER
R1232D161B 制造商:RICOH 制造商全稱(chēng):RICOH electronics devices division 功能描述:PWM STEP-DOWN DC/DC CONVERTER WITH SYNCHRONOUS RECTIFIER
R1232D171A 制造商:RICOH 制造商全稱(chēng):RICOH electronics devices division 功能描述:PWM STEP-DOWN DC/DC CONVERTER WITH SYNCHRONOUS RECTIFIER
R1232D171B 制造商:RICOH 制造商全稱(chēng):RICOH electronics devices division 功能描述:PWM STEP-DOWN DC/DC CONVERTER WITH SYNCHRONOUS RECTIFIER
R1232D181A 制造商:RICOH 制造商全稱(chēng):RICOH electronics devices division 功能描述:PWM STEP-DOWN DC/DC CONVERTER WITH SYNCHRONOUS RECTIFIER
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