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參數資料
| 型號： | FAN5090 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | Two Phase Interleaved Synchronous Buck Converter for VRM 9.x Applications |
| 中文描述： | 兩相交錯同步降壓轉換器的電源模組采用9.x中的應用 |
| 文件頁數： | 15/17頁 |
| 文件大?。?/td> | 183K |
| 代理商： | FAN5090 |
PRODUCT SPECIFICATION
FAN5090
REV. 1.0.1 9/16/03
15
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
2 shows 3 x 1500
μ
F, but the exact number required will vary
with the output voltage and current, according to the formula
for the two phase FAN5090, where D is the duty cycle
(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.
PCB Layout Guidelines
Placement of the MOSFETs relative to the FAN5090 is
critical. Place the MOSFETs so that the trace length of the
HDRV and LDRV pins of the FAN5090 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 FAN5090. That
is, traces that connect to pins LDRV, HDRV, SW, BOOT,
and PGND should be kept far away from the traces that
connect to pins 1 through 7, and pins 18-24.
Place the decoupling capacitors as close to the FAN5090
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
phase 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.
Placing a 1.0
μ
F decoupling cap directly 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.
PC Motherboard Sample Layout and Gerber File
A reference design for motherboard implementation of the
FAN5090 along with the PCAD layout Gerber file and silk
screen can be obtained through your local Fairchild repre-
sentative.
FAN5090 Evaluation Board
Fairchild provides an evaluation board to verify the system
level performance of the FAN5090. It serves as a guide to
performance expectations when using the supplied external
components and PCB layout. Please contact your local
Fairchild representative for an evaluation board.
Additional Information
For additional information contact your local Fairchild
representative.
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相關PDF資料 |
PDF描述 |
|---|---|
| FAN5090MTC | Two Phase Interleaved Synchronous Buck Converter for VRM 9.x Applications |
| FAN5090MTCX | Two Phase Interleaved Synchronous Buck Converter for VRM 9.x Applications |
| FAN5091MTC | Two Slice Interleaved Synchronous Buck Converter |
| FAN5091 | Synchronous Multi-Slice DC-DC Controller(同步多片DC-DC轉換控制器) |
| FAN5092 | High Current System Voltage Buck Converter |
相關代理商/技術參數 |
參數描述 |
|---|---|
| FAN5090_ABC3026B WAF | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| FAN5090_ABC3116B WAF | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| FAN5090MTC | 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 輸出端數量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
| FAN5090MTC_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 輸出端數量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
| FAN5090MTCX | 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 輸出端數量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
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