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參數(shù)資料
| 型號： | TPS54615MPWPREP |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 12 A SWITCHING REGULATOR, 700 kHz SWITCHING FREQ-MAX, PDSO28 |
| 封裝： | PLASTIC, HTSSOP-28 |
| 文件頁數(shù)： | 2/21頁 |
| 文件大?。?/td> | 650K |
| 代理商： | TPS54615MPWPREP |
www.ti.com
OUTPUT FILTER
GROUNDING AND POWERPAD LAYOUT
LAYOUT CONSIDERATIONS FOR THERMAL PERFORMANCE
Connect Pin 1 to Analog Ground Plane
in This Area for Optimum Performance
Minimum Recommended Top
Side Analog Ground Area
0.3478
0.0150
0.06
0.0256
0.1700
0.1340
0.0630
0.0400
0.0180
4 PL
0.2090
0.0130
8 PL
Minimum Recommended Exposed
Copper Area for Powerpad. 5mm
Stencils May Require 10 Percent
Larger Area
0.0650
0.0500
0.0650
0.0339
0.0500
Minimum Recommended Thermal Vias: 8 x 0.013 Diameter Inside
Powerpad Area 4 x 0.018 Diameter Under Device as Shown.
Additional 0.018 Diameter Vias May Be Used if Top Side Analog Ground
Area Is Extended.
0.3820
TPS54611-EP, TPS54612-EP
TPS54613-EP, TPS54614-EP
TPS54615-EP, TPS54616-EP
SGLS293A – FEBRUARY 2005 – REVISED AUGUST 2005
APPLICATION INFORMATION (continued)
The output filter is composed of a 5.2-H inductor and a 470-F capacitor. The inductor is low dc resistance
(16-m
) type, Sumida CDRH104R-5R2. The capacitor used is a 4-V POSCAP with a maximum ESR of 40 m.
The output filter components work with the internal compensation network to provide a stable closed loop
response for the converter.
The TPS54611-16 have two internal grounds (analog and power). Inside the TPS54611-16, the analog ground
ties to all of the noise sensitive signals, while the power ground ties to the noisier power signals. The PowerPAD
is tied internally to the analog ground. Noise injected between the two grounds can degrade the performance of
the TPS54611-16, particularly at higher output currents. However, ground noise on an analog ground plane can
also cause problems with some of the control and bias signals. For these reasons, separate analog and power
ground planes are recommended. These two planes should tie together directly at the IC to reduce noise
between the two grounds. The only components that should tie directly to the power ground plane are the input
capacitor, the output capacitor, the input voltage decoupling capacitor, and the PGND pins of the TPS54611-16.
The layout of the TPS54614 evaluation module is representative of a recommended layout for a 4-layer board.
Documentation for the TPS54614 evaluation module can be found on the Texas Instruments web site
(www.ti.com) under the TPS54614 product folder. See the TPS54614-185 User's Guide (SLVU053) and the
application note (SLVA105).
For operation at full rated load current, the analog ground plane must provide adequate heat dissipating area. A
3 inch by 3 inch plane of 1 ounce copper is recommended, though not mandatory, depending on ambient
temperature and airflow. Most applications have larger areas of internal ground plane available, and the
PowerPAD should be connected to the largest area available. Additional areas on the top or bottom layers also
help dissipate heat, and any area available should be used when 3 A or greater operation is desired. Connection
from the exposes area of the PowerPAD to the analog ground plane layer should be made using 0.013 inch
diameter vias to avoid solder wicking through the vias. Six vias should be in the PowerPAD area with four
additional vias located under the device package. The size of the vias under the package, but not in the exposed
thermal pad area, can be increased to 0.018. Additional vias beyond the 10 recommended that enhance thermal
performance should be included in areas not under the device package.
Figure 11. Recommended Land Pattern for 28-Pin PWP PowerPAD
10
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| TPS54615PWPG4 | 功能描述:直流/直流開關調(diào)節(jié)器 Lo-In Vltg 6A Sync Sync Buck Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS54615PWPR | 功能描述:直流/直流開關調(diào)節(jié)器 Lo-In Vltg 6A Sync Sync Buck Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
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