參數(shù)資料
型號(hào)： TPS2052P
廠商： Texas Instruments, Inc.
英文描述： DUAL POWER-DISTRIBUTION SWITCHES
中文描述： 雙電源分配開(kāi)關(guān)
文件頁(yè)數(shù)： 18/24頁(yè)
文件大?。?/td> 430K
代理商： TPS2052P
TPS2042, TPS2052
DUAL POWER-DISTRIBUTION SWITCHES
SLVS173A – AUGUST 1998 – REVISED APRIL 1999
18
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
host/self-powered and bus-powered hubs (continued)
Bus-powered hubs obtain all power from upstream ports and often contain an embedded function. The hubs
are required to power up with less than one unit load. 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
can be 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
one unit load. 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 functions 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, and 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
μ
F at power up, the device must implement inrush current limiting (see Figure 32).
IN
OC1
EN1
OC2
EN2
GND
1
0.1
μ
F
2
8
3
5
4
7
6
0.1
μ
F
10
μ
F
0.1
μ
F
10
μ
F
GND
OUT1
OUT2
TPS2042
Power Supply
3.3 V
D+
D–
VBUS
Internal
Function
USB
Control
10
μ
F
Internal
Function
Figure 32. High-Power Bus-Powered Function
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