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): 9/42頁
文件大?。?/td> 942K
代理商: TPS2343DDPG3
TPS2343
SLUS644B FEBRUARY 2005 MAY 2005
17
www.ti.com
APPLICATION INFORMATION
+1.5-V and +3.3-V VIO Supply Control
VIO is frequently used to power VIO for both the slot and the bridge so that there is minimal drop between the
slot and the bridge VIO supplies. When calculating the current-limit threshold for VIO, take into account the
current consumption of the slot and the bridge.
The TPS2343 uses external N-channel power MOSFETs for the 1.5-V and 3.3-V VIO supplies. Inrush current
for these supplies is controlled because the slew rate of the supplies are limited. Refer to the VIO Power
Selection in the Application Section.
Both 1.5-V and 3.3-V VIO slew rates are usually set to the same value capacitor, CVIOGx to AGND and on 3VIOGx
to AGND. IGATE is 10 A for both 15VIOGx and 3VIOGx. Slew rate can be estimated as:
dV
dt
+
I
GATE
C
VIOGx
PCI specifications allow for 1.5-V and 3.3-V VIO 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
VIOGx
Using the recommended value for CVIOGx = 0.022 F and the typical value for IGATE = 5 A, average inrush
current can be estimated as:
I
INRUSH + 150 mF
10
mA
0.022
mF +
0.068A
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