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參數資料
| 型號： | TPS2459RHBR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC32 |
| 封裝： | PLASTIC, QFP-32 |
| 文件頁數： | 31/44頁 |
| 文件大小： | 983K |
| 代理商： | TPS2459RHBR |
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PRODUCTPREVIEW
Layout Considerations
Load Current Path
(a)
(b)
*Additional details ommoted for clarity.
Sense
Resistor
TPS2459
13
12
14
R
SET
TPS2459
13
12
14
R
SET
Load Current Path
www.ti.com ............................................................................................................................................................................................ SLUS917 – FEBRUARY 2009
TPS2459 applications require careful attention to layout to ensure proper performance and minimize
susceptibility to transients and noise. IImportant points to consider include:
Connect AGND and all GND pins to a ground plane.
Place a 0.01-F or larger ceramic bypass capacitors on IN12 and VDD3.
Minimize the loop area created by the leads running to these devices.
Minimize the loop area between the SENM and SENP leads by running them side-by-side.
Use Kelvin connections at the points of contact with R
SENSE Figure 31
Minimize the loop area between the SET and SENP leads.
Connect the SET leads to the same Kelvin points as the SENP leads, or as close to these points as possible.
Size the following runs to carry at least 20 A:
–
Runs on both sides of RSENSE
–
Runs from the drains and sources of the external FETs
Minimize the loop area between the OUT12 and SENP leads.
Size the runs to IN3 and OUT3 to carry at least 1 A.
Soldering the powerpad of the TPS2459 to the board will improve thermal performance.
Figure 31. Recommended RSENSE Layout
Copyright 2009, Texas Instruments Incorporated
37
Product Folder Link(s): TPS2459
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