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参数资料
| 型号： | TPS2068DGNR |
| 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： | GREEN, PLASTIC, MSOP-8 |
| 文件页数： | 9/33页 |
| 文件大小： | 1022K |
| 代理商： | TPS2068DGNR |
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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+
TPS2060
EN2
GND
1
SLVS553K
– MARCH 2005 – REVISED MAY 2011
LOW-POWER BUS-POWERED 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; 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
μF at power up, the device must implement inrush current limiting (see Figure 23). With TPS206x, the
internal functions could draw more than 500 mA, which fits the needs of some applications such as motor driving
circuits.
Figure 23. High-Power Bus-Powered Function
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/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 μF)
Functions must:
– Limit inrush currents
– Power up at <100 mA
The feature set of the TPS206x 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 24).
Copyright
2005–2011, Texas Instruments Incorporated
17
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