參數(shù)資料
型號: TPS2343DDPG3
廠商: TEXAS INSTRUMENTS INC
元件分類: 電源管理
英文描述: 6-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO80
封裝: GREEN, PLASTIC, HTSSOP-80
文件頁數(shù): 11/42頁
文件大?。?/td> 942K
代理商: TPS2343DDPG3
TPS2343
SLUS644B FEBRUARY 2005 MAY 2005
19
www.ti.com
APPLICATION INFORMATION
Layout Considerations
It is important to use good layout practices regarding device placement and etch routing of the
backplane/system board to optimize the performance of the hot plug circuit. Some of the key considerations
are listed here:
D Decoupling capacitors should be located close to the device.
D Any protection devices (e.g. zener clamps) should be located close to the device.
D To reduce insertion loss across the hot plug interface, use wide traces for the supply and return current
paths. A power plane can be used for the supply return or PWRGND nodes.
D Additional copper placed at the land patterns of the sense resistors and pass FETs can significantly reduce
the thermal impedance of these devices, reducing temperature rise in the module and improving overall
reliability.
D Because typical values for current sense resistors can be very low (6 m typical), board trace resistance
between elements in the supply current paths becomes significant. To achieve maximum accuracy of the
overload thresholds, good Kelvin connections to the resistors should be used for the current sense inputs
to the device. The current sense traces should connect symmetrically to the sense resistor land pattern,
in close proximity to the element leads, not upstream or downstream from the device.
TPS2343
LOAD CURRENT PATH
SENSE
RESISTOR
LOAD CURRENT PATH
3VSA
3VISA
3VSA
3VISA
UDG02154
Figure 1. Connecting the Sense Resistors
These recommended layouts provide force-and-sense (Kelvin) connection to the current sense resistor to
minimize circuit board trace resistance.
相關(guān)PDF資料
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TPS2343DDPR 6-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO80
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