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參數(shù)資料
| 型號： | FAN5091 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | Synchronous Multi-Slice DC-DC Controller(同步多片DC-DC轉(zhuǎn)換控制器) |
| 中文描述： | 同步多層DC - DC控制器（同步多片的DC - DC轉(zhuǎn)換控制器） |
| 文件頁數(shù)： | 18/20頁 |
| 文件大小： | 116K |
| 代理商： | FAN5091 |
FAN5091
18
A
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 6
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 two slice FAN5091, 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 operational
temperature. For details on the design of an input filter, refer
to Applications Bulletin AB-15.
Figure 6. Input Filter
Design Considerations and Component
Selection
Additional information on design and component selection
may be found in Fairchild’s Application Note 59.
PCB Layout Guidelines
Placement of the MOSFETs relative to the FAN5091 is
critical. Place the MOSFETs such that the trace length of
the HIDRV and LODRV pins of the FAN5091 to the FET
gates is minimized. A long lead length on these pins will
cause high amounts of ringing due to the inductance of the
trace and the gate capacitance of the FET. This noise
radiates throughout the board, and, because it is switching
at such a high voltage and frequency, it is very difficult to
suppress.
In general, all of the noisy switching lines should be kept
away from the quiet analog section of the FAN5091. That
is, traces that connect to pins 8-17 (LODRV, HIDRV,
PGND and BOOT) should be kept far away from the
traces that connect to pins 1 through 7, and pins 18-24.
Place the 0.1
μ
F decoupling capacitors as close to the
FAN5091 pins as possible. Extra lead length on these
reduces their ability to suppress noise.
Each power and ground pin should have its own via to the
appropriate plane. This helps provide isolation between
pins.
Place the MOSFETs, inductor, and Schottky of a given
slice as close together as possible for the same reasons as
in the first bullet above. Place the input bulk capacitors as
close to the drains of the high side MOSFETs as possible.
In addition, placement of a 0.1
μ
F decoupling cap right on
the drain of each high side MOSFET helps to suppress
some of the high frequency switching noise on the input
of the DC-DC converter.
Place the output bulk capacitors as close to the CPU as
possible to optimize their ability to supply instantaneous
current to the load in the event of a current transient.
Additional space between the output capacitors and the
CPU will allow the parasitic resistance of the board traces
to degrade the DC-DC converter’s performance under
severe load transient conditions, causing higher voltage
deviation. For more detailed information regarding
capacitor placement, refer to Application Bulletin AB-5.
A PC Board Layout Checklist is available from Fairchild
Applications. Ask for Application Bulletin AB-11.
PC Motherboard Sample Layout and Gerber File
A reference design for motherboard implementation of the
FAN5091 along with the PCAD layout Gerber file and silk
screen can be obtained from our marketing department at
408-822-2550.
FAN5091 Evaluation Board
Fairchild provides an evaluation board to verify the system
level performance of the FAN5091. It serves as a guide to
performance expectations when using the supplied external
components and PCB layout. Please call the marketing
department at 408-822-2550 for an evaluation board.
Additional Information
For additional information contact Fairchild Semiconductor’s
Analog & Mixed Signal Products Group Marketing Depart-
ment at 408-822-2550.
I
rms
I
2
--------
2D
4D
2
–
=
1.3mH
+12V
1000mF, 16V
Electrolytic
Vin
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| FAN5091_CAB3116B WAF | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| FAN5091MTC | 功能描述:直流/直流開關轉(zhuǎn)換器 Sync Buck Converter 2Phs Interleaved RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率: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 安裝風格:SMD/SMT |
| FAN5091MTC_Q | 功能描述:DC/DC 開關控制器 Sync Buck Converter 2Phs Interleaved RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 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 安裝風格: 封裝 / 箱體:CPAK |
| FAN5091MTCX | 功能描述:直流/直流開關轉(zhuǎn)換器 Sync Buck Converter 2Phs Interleaved RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率: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 安裝風格:SMD/SMT |
| FAN5091MTF | 功能描述:開關變換器、穩(wěn)壓器與控制器 RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
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