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TPS2048 数据表(PDF) 19 Page - Texas Instruments |
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TPS2048 数据表(HTML) 19 Page - Texas Instruments |
19 / 24 page TPS2048, TPS2058 QUAD CURRENT-LIMITED POWER-DISTRIBUTION SWITCHES SLVS192 – APRIL 1999 19 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 APPLICATION INFORMATION bus-powered hubs Bus-powered hubs 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 functions 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, and 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 Ω and 10 µF at power up, the device must implement inrush current limiting (see Figure 31). IN1 OC1 EN1 OC3 EN3 2 16 13 12 9 15 6 0.1 µF 10 µF 0.1 µF 10 µF Internal Function OUT1 OUT2 Power Supply 3.3 V IN2 OC2 OC4 14 11 0.1 µF 10 µF 0.1 µF 10 µF OUT3 OUT4 10 EN2 EN4 3 4 7 8 GND1 GND2 1 5 Internal Function Internal Function Internal Function 0.1 µF 10 µF USB Control GND VBUS D– D+ TPS2048 Figure 31. High-Power Bus-Powered Function |
类似零件编号 - TPS2048 |
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类似说明 - TPS2048 |
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