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參數(shù)資料
| 型號(hào)： | FAN5070 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | High Performance Programmable Synchronous DC-DC Controller |
| 中文描述： | 高性能可編程同步DC - DC控制器 |
| 文件頁數(shù)： | 11/14頁 |
| 文件大小： | 147K |
| 代理商： | FAN5070 |
FAN5070
REV. 1.0.1 8/7/01
11
PCB Layout Guidelines
Placement of the MOSFETs relative to the FAN5070 is
critical. Place the MOSFETs such that the trace length of
the HIDRV and LODRV pins of the FAN5070 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 FAN5070. That
is, traces that connect to pins 1, 2, 16, and 17 (HIDRV,
SW, LODRV and V
CCP
) should be kept far away from the
traces that connect to pins 3, 13 and 14.
Place the 0.1μF decoupling capacitors as close to the
FAN5070 pins as possible. Extra lead length on these
reduces their ability to suppress noise.
Each V
CC
and GND pin should have its own via to the
appropriate plane. This helps provide isolation between
pins.
Place the MOSFETs, inductor, and Schottky 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 0.1μF 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.
Additional Information
For additional information contact your local Fairchild
Semiconductor representative, or visit us at our web site
www.fairchildsemi.com.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| FAN5070M | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Voltage-Mode SMPS Controller |
| FAN5071 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:High Performance Programmable Synchronous DC-DC Controller for Multi-Voltage Platforms |
| FAN5071AB WAF | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| FAN5071M | 功能描述:DC/DC 開關(guān)控制器 DC/DC 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 |
| FAN5071MX | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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