參數(shù)資料
型號(hào)： TPS2345PWNRND
廠商： TEXAS INSTRUMENTS INC
元件分類(lèi)： 電源管理
英文描述： 4-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO24
封裝： GREEN, TSSOP-24
文件頁(yè)數(shù)： 17/32頁(yè)
文件大?。?/td> 621K
代理商： TPS2345PWNRND
TPS2345
SLUS503B – MARCH 2002 – REVISED AUGUST 2002
24
www.ti.com
APPLICATION INFORMATION
The CompactPCIR hot swap specification requires the following maximum slew rates for the input supplies (see
Table 2).
Table 2. CompactPCIR Hot Swap Slew Rate Specifications
SUPPLY NAME
MAXIMUM
SLEW RATE
5 V
1.5 A/ms
3.3 V
1.5 A/ms
12 V
150 mA/ms
–12 V
150 mA/ms
Since the 12-V supplies have the more stringent limit, they are useful for obtaining an initial estimate for the
IRAMP capacitor. Using the 12-V supply values, equation (5) produces the result shown in equation (6).
C
IRAMP1 +
68
67.5
(0.025
W)
150 mA ms
^ 0.27 mF
A value of 0.27
F can be used, or the next available standard value of 0.33 F provides some margin for
capacitor and sense-resistor tolerances. In either case, equation (5) can be rewritten as equation (7), which is
used here to verify that the 5-V and 3.3-V slew rates are within specification.
di dt
2,3 +
68
67.5
R
SNS2,3
C
IRAMP
where:
RSNS2,3 is in ohms,
CIRAMP is in microfarads, and
(di/dt)2,3 is given in amps/second.
For a CIRAMP of 0.33 F, the maximum di/dt for the 5-V and 3.3-V supplies is 1.02 A/ms and 1.22 A/ms,
respectively, which is well within the cPCIR specification.
protection against faulted loads
The TPS2345 allows the time period of one IRAMP pulse for each back-end plane’s voltage to ramp-up to its
minimum level. After this delay period, the device latches off if an undervoltage fault is subsequently detected.
This nominal delay time, tTIMER, is set by the constant-current charging and subsequent discharging of CIRAMP,
and is therefore determined from equation (8).
t
TIMER + CIRAMP
1.4
1
58
) 1
1.8
where:
CIRAMP is in microfarads.
The resultant fault timer period should be sufficient for most applications; however, it is good design practice
to verify that the delay is long enough for each load.
(6)
(7)
(8)
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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