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| 型号： | TPS2346PW |
| 厂商： | Texas Instruments |
| 文件页数： | 23/30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
23
www.ti.com
APPLICATION INFORMATION
When setting the current limits, it is important to consider the device minimum that may be imposed by the
TPS2346. Using the values given in the electrical tables, equations (2) and (3) follow from equation (1).
For Channels 1, 2 and 3:
R
SNSx
+
16 mV
IMAXx
where:
x = 1, 2 or 3.
For Channel 4:
R
SNS4
+
75 mV
IMAX4
To ensure proper operation across the range of anticipated load currents on each channel, the maximum load
under normal operating conditions must also be considered. To avoid current-limit operation during steady-state
loading, the IMAX level must be set above the expected load. For example, if the 5-V (Channel 2) and 3.3-V
(Channel 3) supplies of the typical application diagram each need to deliver up to 7.5 A, and a 500-mA margin
is desired, using equation (2) yields:
R2 + R3 +
16 mV
8 A
+ 2 mW
Similarly, for up to 5-A capability on Channel 1, equation (2) indicates R1 ` 3 m&. Setting R4 = 200 m&, provides
some margin over a 250 mA load.
setting the inrush slew rate
The TPS2346 is easily programmed for the desired maximum current slew rate during turn-on and turn-off
events. A single capacitor at the IRAMP pin (C2 in the diagram) controls the di/dt for all three positive channels.
Once the sense resistor values have been established, the value for C
IRAMP
, in microfarads, can be determined
from equation (4).
For Channels 1, 2, and 3:
C
IRAMPx
+
68
67.5 R
SNSx
di
dt
x
where:
C
IRAMPx
= the capacitor value indicated to achieve the (di/dt)x limit value,
R
SNSx
= sense resistor in ohms and
(di/dt)
x
= the maximum di/dt rate, in amps/second.
(2)
(3)
(4)
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TPS2346PWR | 功能描述:热插拔功率分布 Optical Network Hot Swap Controller RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
| TPS2346PWRG4 | 功能描述:热插拔功率分布 Optical Network Hot Swap Controller RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
| TPS2350D | 功能描述:热插拔功率分布 Pwr Mngr for Redund -48V Supplies RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
| TPS2350DG4 | 功能描述:热插拔功率分布 Pwr Mngr for Redund -48V Supplies RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
| TPS2350DR | 功能描述:热插拔功率分布 Pwr Mngr for Redund -48V Supplies RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
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