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| 型号： | TPS2065DGNR-1 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封装： | PLASTIC, MSOP-8 |
| 文件页数： | 9/31页 |
| 文件大小： | 915K |
| 代理商： | TPS2065DGNR-1 |
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IN
OC1
OC2
2
8
3
5
4
7
0.1 F
10 F
Internal
Function
OUT1
PowerSupply
3.3V
EN1
6
0.1 F
10 F
OUT2
Internal
Function
0.1 F
10 F
USB
Control
GND
VBUS
D
D+
TPS2062-1
EN2
GND
1
USB POWER-DISTRIBUTION REQUIREMENTS
www.ti.com................................................................................................................................................ SLVS714A – FEBRUARY 2007 – REVISED MARCH 2009
Figure 26. High-Power Bus-Powered Function
USB can be implemented in several ways, and, regardless of the type of USB device being developed, several
power-distribution features must be implemented.
Hosts/SPHs must:
–
Current-limit downstream ports
–
Report overcurrent conditions on USB VBUS
BPHs must:
–
Enable/disable power to downstream ports
–
Power up at <100 mA
–
Limit inrush current (<44
and 10
F)
Functions must:
–
Limit inrush currents
–
Power up at <100 mA
The feature set of the TPS206x-1 allows them to meet each of these requirements. The integrated
current-limiting and overcurrent reporting is required by hosts and self-powered hubs. The logic-level enable and
controlled rise times meet the need of both input and output ports on bus-powered hubs, as well as the input
ports for bus-powered functions (see Figure 27).
Copyright 2007–2009, Texas Instruments Incorporated
17
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