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参数资料
| 型号： | TPS2552DRVT |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO6 |
| 封装： | GREEN, PLASTIC, SON-6 |
| 文件页数： | 11/32页 |
| 文件大小： | 1025K |
| 代理商： | TPS2552DRVT |
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SLVS841D
– NOVEMBER 2008 – REVISED JUNE 2011
SELF-POWERED AND BUS-POWERED HUBS
A SPH has a local power supply that powers embedded functions and downstream ports. This power supply
must provide between 4.75 V to 5.25 V to downstream facing devices under full-load and no-load conditions.
SPHs are required to have current-limit protection and must report overcurrent conditions to the USB controller.
Typical SPHs are desktop PCs, monitors, printers, and stand-alone hubs.
A BPH obtains all power from an upstream port and often contains an embedded function. It must power up with
less than 100 mA. The BPH usually has one embedded function, and power is always available to the controller
of the hub. If the embedded function and hub require more than 100 mA on power up, the power to the
embedded function may need to be kept off until enumeration is completed. This is accomplished by removing
power or by shutting off the clock to the embedded function. Power switching the embedded function is not
necessary if the aggregate power draw for the function and controller is less than 100 mA. The total current
drawn by the bus-powered device is the sum of the current to the controller, the embedded function, and the
downstream ports, and it is limited to 500 mA from an upstream port.
LOW-POWER BUS-POWERED AND HIGH-POWER BUS-POWERED FUNCTIONS
Both low-power and high-power bus-powered functions obtain all power from upstream ports. Low-power
functions always draw less than 100 mA; high-power functions must draw less than 100 mA at power up and can
draw up to 500 mA after enumeration. If the load of the function is more than the parallel combination of 44
and 10
μF at power up, the device must implement inrush current limiting.
USB POWER-DISTRIBUTION REQUIREMENTS
USB can be implemented in several ways regardless of the type of USB device being developed. Several
power-distribution features must be implemented.
SPHs must:
– Current limit downstream ports
– Report overcurrent conditions
BPHs must:
– Enable/disable power to downstream ports
– Power up at <100 mA
– Limit inrush current (<44 and 10 μF)
Functions must:
– Limit inrush currents
– Power up at <100 mA
The feature set of the TPS2552/53 and TPS2552-1/53-1 meets each of these requirements. The integrated
current limiting and overcurrent reporting is required by self-powered hubs. The logic-level enable and controlled
rise times meet the need of both input and output ports on bus-powered hubs and the input ports for
bus-powered functions.
Copyright
2008–2011, Texas Instruments Incorporated
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TPS2552DRVT | 制造商:Texas Instruments 功能描述:PCMCIA Memory Card IC |
| TPS2552DRVT-1 | 功能描述:电源开关 IC - USB Adj Crnt-Ltd Pwr- Dist Sw RoHS:否 制造商:Micrel 电源电压-最小:2.7 V 电源电压-最大:5.5 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:SOIC-8 封装:Tube |
| TPS2552DRVT-1 | 制造商:Texas Instruments 功能描述:PCMCIA Memory Card IC |
| TPS2553 | 制造商:TI 功能描述:intended for applications such as USB where heavy capacitive loads and short-circuits are likely to be encountered capacitive loads and short circuits (More...) |
| TPS2553DBV1EVM-364 | 功能描述:交换机 IC 开发工具 TPS2553DBV1EVM-364 Eval Mod RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:USB Power Switches 工具用于评估:MAX4984E 工作电源电压:2.8 V to 5.5 V |
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