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參數資料
| 型號： | FAN5193 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | Two Phase Interleaved Synchronous Buck Converter |
| 中文描述： | 兩相交錯同步降壓轉換器 |
| 文件頁數： | 19/21頁 |
| 文件大小： | 524K |
| 代理商： | FAN5193 |
PRODUCT SPECIFICATION
FAN5193
REV. 1.0.1 2/4/02
19
PCB Layout Guidelines
Placement of the MOSFETs relative to the FAN5193 is
critical. Place the MOSFETs such that the trace length of
the HIDRV and LODRV pins of the FAN5193 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 FAN5193. 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 0.1μF decoupling capacitors as close to the
FAN5193 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.
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
FAN5193 along with the PCAD layout Gerber file and silk
screen can be obtained through your local Fairchild repre-
sentative.
FAN5193 Evaluation Board
Fairchild provides an evaluation board to verify the system
level performance of the FAN5193. 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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