參數(shù)資料
型號(hào)： 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(yè)數(shù)： 10/42頁(yè)
文件大?。?/td> 942K
代理商： TPS2343DDPR
TPS2343
SLUS644B FEBRUARY 2005 MAY 2005
18
www.ti.com
APPLICATION INFORMATION
3VAUX Supply Control
The TPS2343 3VAUX supply is completely independent of the main supply. Supply status and faults on main
supplies have no effect on 3VAUX and faults on 3VAUX have no effect on main supply operation.
The TPS2343 uses internal power MOSFETs for the 3VAUX supply and voltage multiplying charge pumps to
drive the gates of the power MOSFETs to 8 V. Inrush current for the 3VAUX supply is controlled because the
slew rate of the 3VAUX supply is limited. This slew rate is set by the capacitor from 3VAUXGx to AGND. Slew
rate can be estimated as:
dV
dt
+
I
GATE
C
3VAUXGx
where C3VAUXGx is the capacitor from 3VAUXGx to AGND and IGATE is the 3VAUXG gate charge current.
Inrush current caused by this slewing and any adapter card load capacitance can be estimated as:
PCI specifications allow for 3.3VAUX supply adapter card bulk capacitance of up to 150
F. This load
capacitance causes additional inrush current of:
I
INRUSH + CLOAD
dV
dt
+ C
LOAD
5
mA
C
3VAUXGx
Using the recommended value for C3VAUXGx = 0.022 F and the typical value for IGATE = 5 A, average inrush
current can be estamated as:
I
RUSH + 150 mF
5
mA
0.022
mF +
0.034 A
The 3VAUXx current-sense threshold is internally set and can not be adjusted.
When main power is applied to the TPS2343, all gates are actively held low. When main power is removed,
leakage current can potentially raise gate voltage, but because main power is not applied, no malfunction
occurs. This is noted here as floating gates may be observed during bench testing, but ths is not an application
problem.
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