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)： 7/42頁
文件大?。?/td> 942K
代理商： TPS2343DDPG3
TPS2343
SLUS644B FEBRUARY 2005 MAY 2005
15
www.ti.com
APPLICATION INFORMATION
12-V Supply Control
The TPS2343 integrates an N-channel power MOSFET for the 12-V supply. This switch turns on when
PWRENx is asserted and turns off when PWRENx is deasserted or when there is a fault on any main power
supply to the slot.
Like the 12-V supply, inrush for the 12-V supply is controlled by controlling turn-on slew rate. The 12-V supply
tracks the 12-V supply, so the slew rates of these supplies are directly related. To insure that the power MOSFET
for the 12-V supply fully enhances, the tracking amplifier has a gain of approximately 1.4, producing a 12-V
supply slew rate 40% higher than the 12-V supply slew rate.
PCI specifications allow for 12-V supply adapter card bulk capacitance of up to 150
F. This load capacitance
causes additional inrush current of:
I
INRUSH + CLOAD
dV
dt
+ 150 mF
I
GATE
C
P12VG
1.4
Using the recommended value for CP12VG = 0.022 F and the typical value for IGATE = 10 A, average inrush
current can be estimated as:
I
INRUSH + 150 mF
10
mA
0.022
mF
1.4
+ 0.095 A
An internal current-sense circuit monitors the 12-V supply. The over-current threshold for the 12-V supply is
directly proportional to the resistor from MISET to AGND. Raising the MISET resistor simultaneously raises the
current limit threshold for the 12-V, 5-V, 3.3-V and 12-V supplies. For example, to raise the nominal output
current from the 12-V supply by 20%, increase the MISET resistor 20%. This resistor can be as high as 12 k
if necessary.
+5-V Main Supply Control
The TPS2343 uses external N-channel power MOSFETs for the 5-V supply. Inrush current for this supply is
controlled because the slew rate of the supplies is limited. This slew rate is set by the capacitor from 5VGx to
AGND. Slew rate can be estimated as:
dV
dt
+
I
GATE
C
5VG
where C5VG is the capacitor from 5VGx to AGND and IGATE is the 5VGx gate charge current.
PCI specifications allow for 5-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
5VGx
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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