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)： 20/42頁
文件大?。?/td> 942K
代理商： TPS2343DDPG3
TPS2343
SLUS644B FEBRUARY 2005 MAY 2005
27
www.ti.com
APPLICATION INFORMATION
Example Calculation of RDS(on) for the 5.0 V Main:
D PS low voltage 5.0 V 3% = 4.85 V
D PCI spec lowest voltage to add in card = 4.75 V
D System voltage budget = 4.85 V 4.75 V = 0.1 V
D PCI bus has 8 pins for 5.0 A, 5.0 A/8 pins = 0.625 A/pin
D Contact resistance = 20 m, .625 A x 0.020 = 12.5 mV
D VPCI connector = 12.5 mV + 12.5 mV (return path) = 25 mV
D V power connector = 5.0 A/4 pins = 1.25 A/pin
D Pin contact resistance = 0.002 ,
D V power connector = 1.25A x 0.002 = 2.5 mV, 2.5 mV x 2 = 5 mV
D VRSENSE = 5.0 A x 0.006 = 30 mV
D System voltage budget = VPCI connector + V power connector + VRSENSE +VRDS(on)
D 100 = 25 + 5 + 30 + VRDS(on),
D VRDS(on) = 40 mV
D RDS(on) = 0.040 V/5 A = 8 m
Systems have different parameters but calculating RDS(on) for the different voltages using these assumptions
gives the following results.
Table 3.
VOLTAGE
RDS(on)
+5 V
8 m
+3.3 V
12 m
+3.3 VIO
12 m
+1.5 VIO
4 m
FET Heatsink
Place a layer of copper on the circuit board under the surface mount FET and solder the FET to the board for
good thermal connection. Connect the copper to an inner voltage layer at the same potential or if possible, an
area of copper on the other side of the board.
Decoupling Capacitors
Decoupling is required on the power inputs to the TPS2343. Use 0.1-
F capacitors on the 12 V, 12 V, 5 V, 3.3 V
main and 3.3-VAUX and 1.5-VAUX inputs and keep them close to the TPS2343 voltage input pins.
The pin descriptions for the TPS2343 signal outputs recommend 0.01-
F decoupling capacitors. These are not
required.
相關(guān)PDF資料
PDF描述
TPS2343DDPR 6-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO80
TPS2345PWNRND 4-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO24
TPS2346PWG4 4-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO24
TPS2350DRG4 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO14
TPS2350PWG4 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO14
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