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參數(shù)資料
| 型號： | BP5250-24 |
| 廠商： | Rohm CO.,LTD. |
| 英文描述： | 25 AMP MINIATURE POWER RELAY |
| 中文描述： | 直流/直流轉(zhuǎn)換器 |
| 文件頁數(shù)： | 6/12頁 |
| 文件大?。?/td> | 118K |
| 代理商： | BP5250-24 |
BP5250 / BP5250-24
(2) FET(Q1)
FET is determined by taking the peak current flowed to the external FET, drain-source voltage(VDS),
ON resistance(RDS(ON)), input capacity(Ciss), allowable loss of package, and area of safe operation.
For the basic circuit example(Fig.9), FET of 2SJ529S/Hitachi is used.
Please use FET with the characteristic equal to or than this one.Especially, the input capacity(Ciss), and
ON resistance may cause a larger FET loss. Note the FET with the characteristic equal to or higher to be
used.
The characteristic of 2SJ529S is
VDS
=
60V
ID
=
10A
RDS(ON) =0.17
TYP(ID=
5A, VDS=
4V)
Pch
=20W(Tc=25
°
C)
Ciss
=580PF
(3) Inductor(L1)
inductor L1 is determined by the following expression in consideration of output ripple current.
L is determined from above.
Peak current flowed into the inductor by the determined L is
ip=Io
+
(Vi-Vo)/2
×
1/L1
×
1/f
×
(1-Vo/Vi) [A]
ip for actual usage is calculated back by the L of the expression above.
Ripple current ir by the determined L is
ir=(Vi-Vo)/L1
×
1/f
×
Vo/Vi [A]
As stated above, after L1[H] inductor and the ip[A] peak current are determined, an inductor for these
specifications can be determined. Output ripple voltage is determined by the multiplication of the ir[A] ripple
current and the impedance of the smoothing capacitor.
Vr=ir
×
Zc
Vr: Output ripple voltage [Vp-p]
Zc: Impedance of smoothing capacitor[
]
Vi : Input voltage [V]
Vo: Output voltage [V]
Io : Output current [A]
f
: Oscillation frequency (
￡
190KHz)
n : Ripple current condition
Io/n is ripple current. Normally, n=2.5
～
5 is recommended.
L1
≥
n
×
(Vi-Vo)/Io
×
1/f
×
Vo/Vi [H]
(1) Output voltage and resistance
Output voltage Vo is determined by output ADJ pin voltage(VADJ) and R2, R3.
Estoblishment example
R2(
)
Vo(V)
R3(
)
8.0
5.0
3.3
2.5
1.5
3.3k
10k
20k
10k
10k
18k
30k
33k
10k
2k
Vo=VADJ
×
(1
+
R3/R2)[V] VADJ=1.25V
Note) Please set the resistance to R2
+
R3
≤
55K
to make the best use of
this module performance.
6/11
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| BP5255BR00SP | 制造商:POWGG 功能描述: |
| BP5275-18 | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 3Term Step Dwn DC/DC Cnvrtr Non-Iso 1.8V RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
| BP5275-25 | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 3Term Step Dwn DC/DC Cnvrtr Non-Iso 2.5V RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
| BP5275-33 | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 3Term Step Dwn DC/DC Cnvrtr Non-Iso 3.3V RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
| BP5275-50 | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 3Term Step Dwn DC/DC Cnvrtr Non-Iso 5.0V RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
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