參數(shù)資料
型號: TPS2053BD
廠商: TEXAS INSTRUMENTS INC
元件分類: 電源管理
英文描述: 3-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16
封裝: GREEN, PLASTIC, MS-012AC, SOIC-16
文件頁數(shù): 15/51頁
文件大小: 1451K
代理商: TPS2053BD
IN
OC1
OC2
2
8
3
5
4
7
0.1
F
10
F
Internal
Function
OUT1
Power Supply
3.3 V
EN1
6
0.1
F
10
F
OUT2
Internal
Function
0.1
F
10
F
USB
Control
GND
VBUS
D
D+
EN2
GND
1
TPS2042B
SLVS514K – JUNE 2010 – REVISED DECEMBER 2008
www.ti.com
Figure 32. High-Power Bus-Powered Function (Example, TPS2042B)
USB POWER-DISTRIBUTION REQUIREMENTS
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/self-powered hubs must:
Current-limit downstream ports
Report overcurrent conditions on USB VBUS
Bus-powered hubs must:
Enable/disable power to downstream ports
Power up at <100 mA
Limit inrush current (<44
and 10 mF)
Functions must:
Limit inrush currents
Power up at <100 mA
The feature set of the TPS204xB/TPS205xB 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 33 through Figure 36).
22
Copyright 2010–2008, Texas Instruments Incorporated
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