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參數(shù)資料
| 型號： | TPS204X |
| 廠商： | Texas Instruments, Inc. |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | USB POWER DISTRIBUTION |
| 中文描述： | USB電源分布 |
| 文件頁數(shù)： | 17/19頁 |
| 文件大?。?/td> | 116K |
| 代理商： | TPS204X |
Self-Powered Hub Port Protection Topologies
13
TPS202x/3x and TPS204x/5x USB Power Distribution
The pulse width of the erroneous OC response is typically less than 200
μ
s
without an output capacitor on the device when hot plugging a 10-
μ
F aluminum
electrolytic capacitor. If the hot-plug load is greater than 10-
μ
F, the OC pulse width
will be greater. Since the OC response is dependent on the many components
in the power distribution, it is recommended to test the power distribution system
with only a pullup resistor to determine the necessary filter to attenuate the glitch.
Once the pulse width of the glitch is known, the filter resistance and capacitance
values can be calculated using the equation below. For most applications 0.5 to
1 ms is sufficient. As a precautionary note, the pullup resistance should not be
so large as to cause a false overcurrent response at startup when the hub
controller voltage reaches its final voltage well before the OC pin voltage.
Tfilter
Tstartup
Rfilter
(Rpullup
Cfilter
Rfilter)
(1)
Cfilter
GND
OC1
TPS2042
IN
OUT1
EN1
OUT2
EN2
OC2
R(FILTER)
R(FILTER)
V(pullup)
Voc
C(FILTER)
To USB Controller
Figure 11. R-C Filter for the OC Pin
Self/Bus Powered Hybrid Hub
Many available self-powered hubs are designed to switch to bus-powered mode
when local power is not available. The TPS2041 and TPS2021 can be used in
the upstream vbus power line, as shown is Figure 12, to prevent power flow
upstream. A disable signal should be used to turn off the power switch when the
local power supply is present.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TPS203X | USB POWER DISTRIBUTION |
| TPS2032P | POWER-DISTRIBUTION SWITCHES |
| TPS2033P | POWER-DISTRIBUTION SWITCHES |
| TPS2052P | DUAL POWER-DISTRIBUTION SWITCHES |
| TPS2100D | VAUX POWER-DISTRIBUTION SWITCHES |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPS2051 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:POWER-DISTRIBUTION SWITCHES |
| TPS2051A | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:0.7A. 2.7-5.5V Single Hi-Side MOSFET. Fault Report. Act-High Enable |
| TPS2051AD | 功能描述:電源開關(guān) IC - USB 0.7A 2.7-5.5V Hi RoHS:否 制造商:Micrel 電源電壓-最小:2.7 V 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:SOIC-8 封裝:Tube |
| TPS2051ADG4 | 功能描述:電源開關(guān) IC - USB 0.7A 2.7-5.5V Sngl Hi-Side MOSFET RoHS:否 制造商:Micrel 電源電壓-最小:2.7 V 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:SOIC-8 封裝:Tube |
| TPS2051ADR | 功能描述:電源開關(guān) IC - USB 0.7A 2.7-5.5V Sngl Hi-Side MOSFET RoHS:否 制造商:Micrel 電源電壓-最小:2.7 V 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:SOIC-8 封裝:Tube |
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