參數(shù)資料
型號(hào)： R1224N332L
廠商： Ricoh Co., Ltd.
英文描述： PWM/VFM step-down DC/DC Converter
中文描述： 脈寬調(diào)制/ VFM的降壓型DC / DC轉(zhuǎn)換器
文件頁數(shù)： 9/42頁
文件大?。?/td> 876K
代理商： R1224N332L
R1224N
How to Adjust Output Voltage and about Phase Compensation
As for Adjustable Output type, feedback pin (V
FB
) voltage is controlled to maintain 1.0V.
Output Voltage, V
OUT
is as following equation:
V
OUT
: R2
+
R4
=
V
FB
: R2
V
OUT
=
V
FB
×
(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/(2
π×
R4
×
C4)
For example, if L
=
27
μ
H, C3
=
47μF, 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 V
OUT
is set at 2.5V, R2
=
22k
is appropriate.
R3 prevents feedback of the noise to V
FB
pin, about 2.7k
is appropriate value.
CE CONTROL
C3
L
LOAD
C1
R1
C2
PMOS
SD
C4
R3
R4
R2
R1224N
EXT
GND
2
V
FB
V
IN
CE
5
1
3
4
9
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