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參數(shù)資料
| 型號(hào)： | TPS202X |
| 廠商： | Texas Instruments, Inc. |
| 元件分類(lèi)： | 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(yè)數(shù)： | 13/19頁(yè) |
| 文件大小： | 116K |
| 代理商： | TPS202X |
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Self-Powered Hub Port Protection Topologies
9
TPS202x/3x and TPS204x/5x USB Power Distribution
Ch. 1
Ch. 2
Figure 6. Four-Port Ganged Hub Using 100
μ
F Aluminum Electrolytic
Individual Port Protection
Individual port protection has two advantages over ganged port protection in the
USB power distribution system: individual port fault isolation, and better voltage
droop performance. In a ganged-port protection system, a fault on a single port
will interrupt service to an adjacent port. In an individual port protection system,
a fault can be isolated without interruption to the adjacent ports. Also, individual
port protection provides better voltage droop performance by the resistive
isolation of the power switches between ports, reducing charge sharing and
voltage droop during hot plug events.
The TPS2042 is an ideal device for a two-port hub requiring an individual port
protection solution; the device is rated for a continuous current of 0.5 A per switch
with a typical current limit of 0.9 A. The TPS2042 also features independent
thermal protection for each switch, which disables the switch in overcurrent when
an over temperature condition occurs. A two-port hub can be designed with up
to 71 m
of trace resistance on the higher current path using a 5.05-V
±
3% power
supply and two ferrite beads on each port with a resistances of 10 m
or less. If
more trace resistance is needed, a tighter tolerance power supply should be
used.
V
PS
n
number of ports
4.75 V
n
0.5 A
R
TRACE
0.5 A
R
SWITCH
2
0.5 A
R
BEAD
R
SWITCH
135 m
Using the above equation the power supply tolerance can be calculated for a
three- and four-port individually protected hub using the TPS204x power switch
devices. The tolerance of the power supply must be such that the voltage will not
exceed 5.25 V or drop below 4.75 V over all conditions. The same 10-
μ
F/44-
USB load was used for the voltage droop test on the individually protected part.
Figure 7 shows a simplified individual port protection schematic, and Figure 8
shows the TPS2044 in an individual port protection USB application.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TPS204X | USB POWER DISTRIBUTION |
| TPS203X | USB POWER DISTRIBUTION |
| TPS2032P | POWER-DISTRIBUTION SWITCHES |
| TPS2033P | POWER-DISTRIBUTION SWITCHES |
| TPS2052P | DUAL POWER-DISTRIBUTION SWITCHES |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPS2030 | 制造商:TI 制造商全稱(chēng):Texas Instruments 功能描述:POWER-DISTRIBUTION SWITCHES |
| TPS2030D | 功能描述:電源開(kāi)關(guān) IC - USB 0.22A 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 |
| TPS2030D | 制造商:Texas Instruments 功能描述:IC 300MA POWER DIST SW 8-SOIC 制造商:Texas Instruments 功能描述:IC, 300MA POWER DIST SW 8-SOIC 制造商:Texas Instruments 功能描述:IC, 300MA POWER DIST SW 8-SOIC; Primary Input Voltage:5.5V; No. of Outputs:1; Output Current:200mA; Voltage Regulator Case Style:SOIC; No. of Pins:8; Operating Temperature Min:-40C; Operating Temperature Max:85C; SVHC:No SVHC ;RoHS Compliant: Yes |
| TPS2030D | 制造商:Texas Instruments 功能描述:Analog Switch IC On-Resistance Rds(on): |
| TPS2030DG4 | 功能描述:電源開(kāi)關(guān) IC - USB 0.22A 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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