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| 型号： | TPS2346PW |
| 厂商： | Texas Instruments |
| 文件页数： | 25/30页 |
| 文件大小： | 490K |
| 描述： | IC HOT SWAP POWER MGR 24-TSSOP |
| 标准包装： | 60 |
| 类型： | 热交换控制器 |
| 应用： | 光纤学网络（ONET） |
| 内部开关： | 无 |
| 电源电压： | -5.2V，3.3V，5V，5.15V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 24-TSSOP |
| 包装： | 管件 |
| 其它名称： | 296-12956-5 |
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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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