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參數資料
| 型號： | TPS2346PWRG4 |
| 廠商： | Texas Instruments |
| 文件頁數： | 24/30頁 |
| 文件大小： | 490K |
| 描述： | IC HOT SWAP POWER MGR 24-TSSOP |
| 標準包裝： | 2,000 |
| 類型： | 熱交換控制器 |
| 應用： | 光纖學網絡（ONET） |
| 內部開關： | 無 |
| 電源電壓： | -5.2V，3.3V，5V，5.15V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 24-TSSOP（0.173"，4.40mm 寬） |
| 供應商設備封裝： | 24-TSSOP |
| 包裝： | 帶卷 (TR) |
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TPS2346
SLUS529 MAY 2002
24
www.ti.com
APPLICATION INFORMATION
To complete the design of the power interface for the plugin shown in the typical application diagram, assume
that a maximum slew rate of 1.5 A/ms is specified for each of the three positive-voltage loads. A value for
capacitor C2 must still be determined. Inspection of equation (4) indicates that, given the same di/dt requirement
on all supplies, the supply channel(s) with the lowest-value sense resistor dictates the minimum value for the
IRAMP capacitor. Therefore, the 5-V and 3.3-V supplies are suggested in this case for obtaining an initial
estimate for C
IRAMP
. Using the associated values, equation (4) produces the result shown in equation (5).
C
IRAMP2,3
+
68
67.5
(
0.002 W
)
1500 As
^ 0.336 mF
A value of 0.33 礔 can be used, or the next available standard value of 0.39 礔 provides some margin for
capacitor and sense-resistor tolerances. In either case, equation (4) can be rewritten as equation (6), which is
used here to verify that the 5.15-V slew rate is still within specification.
didt
x
+
68
67.5 R
SNSx
C
IRAMPx
where:
R
SNSx
is in ohms,
C
IRAMPx
is the value suggested by equation (5) in microfarads, and
(di/dt)
x
is given in amps/second.
For a C
IRAMP
of 0.39 礔, the maximum di/dt for the 5.15-V supply is approximately 860 mA/ms which is well
within the example requirement.
protection against faulted loads
The TPS2346 allows the time period of one IRAMP pulse for each back-end planes 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, t
TIMER
, is set by the constant-current charging and subsequent discharging of C
IRAMP
,
and is therefore determined from equation (7).
t
TIMER
+ C
IRAMP
1.4
1
58
)
1
1.8
where:
C
IRAMP
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.
(5)
(6)
(7)
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