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| 型号： | FAN5094MTC |
| 厂商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 中文描述： | 3 A SWITCHING CONTROLLER, 2000 kHz SWITCHING FREQ-MAX, PDSO28 |
| 封装： | TSSOP-28 |
| 文件页数： | 11/22页 |
| 文件大小： | 182K |
| 代理商： | FAN5094MTC |
PRODUCT SPECIFICATION
FAN5094
REV. 1.0.2 5/13/02
19
voltage of the MOSFET’s body diode. Power capability is
not a criterion for this device, as its dissipation is very small.
Output Filter Capacitors
The output bulk capacitors of a converter help determine its
output ripple voltage and its transient response. It has
already been seen in the section on selecting an inductor that
the ESR helps set the minimum inductance. For most con-
verters, the number of capacitors required is determined by
the transient response and the output ripple voltage, and
these are determined by the ESR and not the capacitance
value. That is, in order to achieve the necessary ESR to meet
the transient and ripple requirements, the capacitance value
required is already very large.
The most commonly used choice for output bulk capacitors
is aluminum electrolytics, because of their low cost and low
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 FAN5094 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; 0.1F and 0.01F 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 5. 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 1.3H 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-phase buck converter. Figure
5 shows 3 x 1000
F, but the exact number required will vary
with the output voltage and current, according to the formula
for the four phase FAN5094, 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 nd out the ripple current rating at the expected opera-
tional temperature. For details on the design of an input lter,
refer to Applications Bulletin AB-16.
Figure 5. 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
out
4
--------- 4DC
16DC2
–
=
1.3
H
+12V
1000
F, 16V
Electrolytic
Vin
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相关代理商/技术参数 |
参数描述 |
|---|---|
| FAN5094MTC_Q | 功能描述:DC/DC 开关控制器 Buck Converter Hi Cur Sys Voltage RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| FAN5094MTCX | 功能描述:DC/DC 开关控制器 Buck Converter Hi Cur Sys Voltage RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| FAN5098 | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Two Phase Interleaved Synchronous Buck Converter for AMD Hammer⑩ |
| FAN5098-BAB3116B WAF | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| FAN5098-BCB3116B WAF | 制造商:Fairchild Semiconductor Corporation 功能描述: |
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