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參數(shù)資料
| 型號： | TPS2058D |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | QUAD CURRENT-LIMITED POWER-DISTRIBUTION SWITCHES |
| 中文描述： | 四限流配電開關(guān) |
| 文件頁數(shù)： | 19/24頁 |
| 文件大小： | 424K |
| 代理商： | TPS2058D |
TPS2048, TPS2058
QUAD CURRENT-LIMITED POWER-DISTRIBUTION SWITCHES
SLVS192 – APRIL 1999
19
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
bus-powered hubs
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 31).
IN1
OC1
EN1
OC3
EN3
2
16
13
12
9
15
6
0.1
μ
F
10
μ
F
0.1
μ
F
10
μ
F
Internal
Function
OUT1
OUT2
Power Supply
3.3 V
IN2
OC2
OC4
14
11
0.1
μ
F
10
μ
F
0.1
μ
F
10
μ
F
OUT3
OUT4
10
EN2
EN4
3
4
7
8
GND1
GND2
1
5
Internal
Function
Internal
Function
Internal
Function
0.1
μ
F
10
μ
F
USB
Control
GND
VBUS
D–
D+
TPS2048
Figure 31. High-Power Bus-Powered Function
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