參數(shù)資料
型號(hào)： FAN5092
廠商： Fairchild Semiconductor Corporation
英文描述： High Current System Voltage Buck Converter
中文描述： 高電流系統(tǒng)電壓降壓轉(zhuǎn)換器
文件頁(yè)數(shù)： 17/20頁(yè)
文件大小： 108K
代理商： FAN5092
PRODUCT SPECIFICATION
FAN5092
REV. 1.0.7 6/20/02
17
ESR. The only type of aluminum capacitor used should be
those that have an ESR rated at 100kHz. Consult Application
Bulletin AB-14 for detailed information on output capacitor
selection.
For higher frequency applications, particularly those running
the FAN5092 oscillator at >1MHz, Oscon or ceramic capaci-
tors may be considered. They have much smaller ESR than
comparable electrolytics, but also much smaller capacitance.
The output capacitance should also include a number of
small value ceramic capacitors placed as close as possible to
the processor; 0.1μF and 0.01μF are recommended values.
Input Filter
The DC-DC converter design may include an input inductor
between the system main supply and the converter input as
shown in Figure 4. This inductor serves to isolate the main
supply from the noise in the switching portion of the DC-DC
converter, and to limit the inrush current into the input capac-
itors during power up. A value of 1.3μH is recommended.
It is necessary to have some low ESR capacitors at the input
to the converter. These capacitors deliver current when the
high side MOSFET switches on. Because of the interleaving,
the number of such capacitors required is greatly reduced
from that required for a single-slice buck converter. Figure 5
shows 3 x 1000
μ
F, but the exact number required will vary
with the output voltage and current, according to the formula
for the four slice FAN5092, where DC is the duty cycle,
DC = Vout / Vin. Capacitor ripple current rating is a function
of temperature, and so the manufacturer should be contacted
to find out the ripple current rating at the expected opera-
tional temperature. For details on the design of an input filter,
refer to Applications Bulletin AB-16.
Figure 4. Input Filter
Design Considerations and Component
Selection
Additional information on design and component selection
may be found in Fairchild’s Application Note 59.
I
rms
I
4
--------
4DC
16DC
2
–
=
1.3
μ
H
+12V
1000
μ
F, 16V
Electrolytic
Vin
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
FAN5092_BBB3026B WAF 制造商:Fairchild Semiconductor Corporation 功能描述:
FAN5092_BBB3116B WAF 制造商:Fairchild Semiconductor Corporation 功能描述:
FAN5092_BBC3116B WAF 制造商:Fairchild Semiconductor Corporation 功能描述:
FAN5092MTC 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 Buck Converter Hi Cur Sys Voltage 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
FAN5092MTC_Q 功能描述:DC/DC 開關(guān)控制器 Buck Converter Hi Cur Sys Voltage RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
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