參數(shù)資料
型號： SI9140
廠商： Vishay Intertechnology,Inc.
英文描述： SMP Controller For High Performance Process Power Supplies
中文描述： SMP的高性能控制器過程電源
文件頁數(shù)： 15/15頁
文件大小： 470K
代理商： SI9140
Si9140
Vishay Siliconix
FaxBack 408-970-5600, request 70026
www.siliconix.com
S-58034—Rev. G, 15-Mar-99
15
INDUCT OR
The size and value of the inductor are critical in meeting
overall circuit dimensional requirements and in assuring
proper transient voltage regulation. The size of the core is
determined by the output power, the material of the core, and
the operating frequency. To handle higher output power, the
core must be larger. Luckily, a higher switching frequency will
lower the inductance value, decreasing the core size.
However, a higher switching frequency can also mean greater
core loss.
In applications where the dc flux density is high and the ac
flux density swing is only 100 to 200 gauss, the core loss will
be negligible compared to the wire loss. Kool Mu is the best
material to use at 500 kHz to deliver 30 W in the minimum
volume. Ferrite has a lower core cost and loss at this
frequency, but the core size is fairly large. If the power supply
is designed on the motherboard and space is not a critical
issue, ferrite is a better choice.
The higher switching frequency reduces the core size by
decreasing the amount of energy that must be stored between
switching periods. It also accelerates the transient response
to the load by decreasing the inductance value. The
inductance is calculated with following equation:
I = desired output current ripple. Typically
I = 25% of
maximum output current.
I
RMSSW
R
SW
I
RMSRECT
R
RECT
Q
SW
Q
RECT
V
IN
V
O
I
O
f
OSC
η
τ
C
=
=
=
=
=
=
=
=
=
=
=
=
Switch rms current
Switch on resistance
Synchronous rectifier rms current
Synchronous rectifier on resistance
Total gate charge of switch
Total gate charge of synchronous rectifier
Input voltage
Output voltage
Output current
Switching frequency
efficiency
Crossover time
I
PEAK
I
PP
I
O
0 A
Current
time
P
Dissipation
in switch
I
RMS SW
2
R
SW
×
Q
---------------------------------------------
V
f
I
----------------------------------------------------
V
f
+
+
=
I
RMS SW
I
PEAK
2
I
PP
2
I
PEAK
+
+
I
PP
×
(
)
V
IN
------------------
×
=
P
Dissipation
in synchronous rectification
I
RMS RECT
2
R
RECT
×
=
Q
---------------------------------------------------
V
f
+
I
RMS RECT
I
PEAK
2
I
PP
2
I
PEAK
+
+
I
PP
×
(
)
V
V
O
IN
–
----------------------
×
=
I
PP
I
PEAK
I
+
=
I
V
OSC
2
IN
------------------------------------
=
I
PEAK
P
-----------------------------------------------------
0.5
V
I
)
–
O
=
P
IN
V
------------------
I
O
=
L
V
2
IN
OSC
--------------------------------------
=
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SI9140CQ 制造商:VISHAY 制造商全稱:Vishay Siliconix 功能描述:SMP Controller For High Performance Process Power Supplies
SI9140CQ-T1 功能描述:電壓模式 PWM 控制器 SMP Controller RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel
SI9140CQ-T1-E3 功能描述:電壓模式 PWM 控制器 Switching Power Supply Controller RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel
SI9140CY 功能描述:電壓模式 PWM 控制器 SMP Controller RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel
SI9140CY-E3 功能描述:電壓模式 PWM 控制器 Switching Power Supply Controller RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel
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