參數(shù)資料
型號： TPS2343DDPR
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)： 8/42頁
文件大?。?/td> 942K
代理商： TPS2343DDPR
TPS2343
SLUS644B FEBRUARY 2005 MAY 2005
16
www.ti.com
APPLICATION INFORMATION
Using the recommended value for C5VGx = 0.27 F and the typical value for IGATE = 100 A, average inrush
current can be estimated as:
I
INRUSH + 3000 mF
100
mA
0.27
mF +
1.11 A
An external current-sense resistor monitors the 5-V supply. The calculation of external resistor values is shown
in the determining component values section. The over-current thresholds is directly proportional to the resistor
from MISET to AGND and inversely proportional to the current-sense resistor. Raising the MISET resistor
simultaneously raises the current limit threshold for the 12-V, 5-V, 3.3-V and 12-V supplies. This resistor can
be as high as 12 k
if necessary.
+3.3-V Main Supply Control
The TPS2343 uses external N-channel power MOSFETs for the 3.3-V supply. Inrush current for this supply is
controlled because the slew rate of the supply is limited. These slew rates are set by the capacitor from 3VGx
to AGND. Slew rate can be estimated as:
dV
dt
+
I
GATE
C
3VGx
where C3VGx is the capacitor from 3VGx to AGND and IGATE is the 3VGx gate charge current.
PCI specifications allow for 3.3-V supply adapter card bulk capacitance of up to 3000
F. This load capacitance
causes additional inrush current of:
I
INRUSH + CLOAD
dV
dt
+ 3000 mF
I
GATE
C
3VGx
Using the recommended value for C3VGx = 0.27 F and the typical value for IGATE = 100 A, average inrush
current can be estimated as:
I
INRUSH + 3000 mF
100
mA
0.27
mF +
1.11 A
An external current-sense resistor monitors the 3.3-V supply. The calculation of external resistor values is
shown in the determining component values section.The over-current threshold is directly proportional to the
resistor from MISET to AGND and inversely proportional to the current-sense resistor. Raising the MISET
resistor simultaneously raises the current limit threshold for the 12-V, 5-V, 3.3-V and 12-V supplies. This
resistor can be as high as 12 k
if necessary.
相關(guān)PDF資料
PDF描述
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
TPS2359RHHT 2-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC36
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