參數(shù)資料
型號： TPS2552DRVR-1
廠商： TEXAS INSTRUMENTS INC
元件分類： 電源管理
英文描述： 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO6
封裝： GREEN, PLASTIC, SON-6
文件頁數(shù)： 11/32頁
文件大?。?/td> 1025K
代理商： TPS2552DRVR-1
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
19
相關(guān)PDF資料
PDF描述
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