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)： 24/42頁(yè)
文件大?。?/td> 942K
代理商： TPS2343DDPR
TPS2343
SLUS644B FEBRUARY 2005 MAY 2005
30
www.ti.com
APPLICATION INFORMATION
Current Regulation and Over Current Protection
In the event of excessively high slot current for the 3.3-V main, 5-V main, or VIO supplies, the TPS2343 regulates
load current at the maximum specified current for a fixed 5 ms. If the current does not reduce below the maximum
in that time, the TPS2343 shuts down main power to that slot. This minimizes the risk of power rail droop on
adjacent slots while at the same time allowing marginal cards to continue to function through brief, high-current
demands.
Control of high-current demand is accomplished using closed-loop regulation of the gate voltage, as shown in
the block diagram below.
+
67
66
75
74
69
68
SQ
Q
R
100
ms
Delay
5ms
Delay
SQ
Q
R
Main
Fault
Latch
Regulation
Mode
Latch
VIOSA
VIOISA
3VSA
3VISA
5VSA
5VISA
Fault
23mV
63mV
53mV
3
ms
Delay
Over Temperature
12V Over Current
+12V Over Current
PWREN
+
65
5VGA
76
3VGA
70
15VIOGA
73
3VIOGA
Figure 5. Current Regulation Functional Block Diagram (one slot shown)
Once an overload has been detected on one of these three supplies, the regulation mode latch is set, and gate
voltage is reduced. At the same time, a 5-ms timer starts. If the timer elapses without the load current reducing,
the main fault latch is set, and the slot latchs off until power is shut off and restarted by the host. If the overload
reduces for more than 100
s, the regulation mode latch clears and the 5-ms timer resets.
For excessively-high slot current on the 12-V main, 12-V main, and 3.3-V auxiliary supplies, the TPS2343
shuts down 3
s after the fault to prevent disturbance to power on the backplane or damage to the TPS2343.
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