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參數(shù)資料
| 型號(hào)： | TPS2062QDGNRQ1 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封裝： | GREEN, PLASTIC, MSOP-8 |
| 文件頁(yè)數(shù)： | 6/24頁(yè) |
| 文件大?。?/td> | 664K |
| 代理商： | TPS2062QDGNRQ1 |
第1頁(yè)第2頁(yè)第3頁(yè)第4頁(yè)第5頁(yè)當(dāng)前第6頁(yè)第7頁(yè)第8頁(yè)第9頁(yè)第10頁(yè)第11頁(yè)第12頁(yè)第13頁(yè)第14頁(yè)第15頁(yè)第16頁(yè)第17頁(yè)第18頁(yè)第19頁(yè)第20頁(yè)第21頁(yè)第22頁(yè)第23頁(yè)第24頁(yè)
IN
OC1
EN1
OC2
EN2
GND
0.1
F
2
8
3
5
4
7
33
F
33
F
GND
1
OUT1
TPS2062
Power Supply
D+
D
VBUS
GND
D+
D
VBUS
Downstream
USB Ports
USB
Controller
3.3 V
5 V
33
F
GND
OUT2
D+
D
VBUS
33
F
GND
D+
D
VBUS
6
0.1
F
0.1
F
0.1
F
0.1
F
SLVSA01
– AUGUST 2009
Figure 23. Typical Four-Port USB Host / Self-Powered Hub
BPHs obtain all power from upstream ports and often contain an embedded function. The hubs are required to
power up with less than one unit load. The BPH usually has one embedded function, and power is always
available to the controller of the hub. If the embedded function and hub require more than 100 mA on power up,
the power to the embedded function may need to be kept off until enumeration is completed. This can be
accomplished by removing power or by shutting off the clock to the embedded function. Power switching the
embedded function is not necessary if the aggregate power draw for the function and controller is less than one
unit load. The total current drawn by the bus-powered device is the sum of the current to the controller, the
embedded function, and the downstream ports, and it is limited to 500 mA from an upstream port.
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 24). With TPS2062, the
internal functions could draw more than 500 mA, which fits the needs of some applications such as motor driving
circuits.
14
Copyright
2009, Texas Instruments Incorporated
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