參數資料
型號： TPS2346PWRG4
廠商： Texas Instruments
文件頁數： 25/30頁
文件大?。?/td> 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)
TPS2346
 
SLUS529  MAY 2002
25
www.ti.com
APPLICATION INFORMATION
Due to the potential three-phase nature of the load current ramp (refer to Figure 20), the increasing load voltage
may also have three distinct periods. The first phase is during the slow turn-on period at the start of each IRAMP
cycle. Depending on a number of factors, significant voltage ramping may or may not occur during this time.
For verification of the fault timeout delay, the worst case situation is no appreciable load charging (i.e., a longer
overall charge time); therefore it is assumed that no voltage ramp occurs here.
The next phase is the linear load current ramp period. For any device channel x, if the IMAX level is not reached
while charging a given load capacitor of C
Lx
, then the time to reach the input dc level, V
INx
, is estimated by
equation (8).
t
SSx
+
2 C
Lx
  C
IRAMP
  K
X
  R
SNSx
  V
INx
58 mA
where:
K
X
 = 67.5 for Channels 1, 2, and 3, and
K
X
 = 7.5 for Channel 4.
For example, assuming the 5-V back-end plane in this application has 220-礔 bulk capacitance, the anticipated
typical ramp-up time is about 1.41 ms.
During inrush slewing, the load current ramp tracks the voltage ramp on the IRAMP capacitor, up to a voltage
of about 1.35 V on the IRAMP pin. Therefore, the time duration of this ramp activity, t
IRAMP
, is given by
equation (9).
t
IRAMP
+
C
IRAMP
 
(
1.25 V
)
58
where:
C
IRAMP
 is in microfarads.
If, for any channel, the time for soft-start charging of the load voltage is greater than the current ramp period,
(t
SSx
 > t
IRAMP
), back-end plane ramp-up completes at the dc IMAX level. In this case, the following procedure
can be used to estimate load ramp-up time.
First, equation (10) is used to determine the load voltage level, v
Lx
(t), attained during the current ramp period.
v
Lx
t
IRAMP
+
58 mA
2 C
Lx
  C
IRAMP
  K
X
  R
SNSx
 
t
IRAMP
2
Once this voltage level is known, it can be used to estimate the additional charging time required at constant
current to reach the input dc potential, t
CCx
. This time is calculated from equation (11).
t
CCx
+
C
Lx
 
V
INx
* V
Lx
t
IRAMP
IMAXx
The sum of t
IRAMP
 and t
CCx
 can then be used to estimate the total load ramp-up time for Channel x.
(8)
(9)
(10)
(11)
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