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參數(shù)資料
| 型號(hào)： | ISP1520BD |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 總線控制器 |
| 英文描述： | Hi-Speed Universal Serial Bus hub controller |
| 中文描述： | UNIVERSAL SERIAL BUS CONTROLLER, PQFP64 |
| 封裝： | 10 X 10 MM, 1.40 MM HEIGHT, PLASTIC, MS-026, SOT-314-2, LQFP-64 |
| 文件頁數(shù)： | 13/51頁 |
| 文件大小： | 259K |
| 代理商： | ISP1520BD |
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Philips Semiconductors
ISP1520
Hi-Speed USB hub controller
Product data
Rev. 02 — 04 May 2004
13 of 51
9397 750 11689
Koninklijke Philips Electronics N.V. 2004. All rights reserved.
9.1.2
Power switching
Power switching of downstream ports can be done
individually
or
ganged
, where all
ports are simultaneously switched with one power switch. The ISP1520 supports both
modes, which can be selected using input PSWn_N; see
Table 5
.
Voltage drop requirements:
Self-powered hubs are required to provide a minimum
of 4.75 V to its output port connectors at all legal load conditions. To comply with
Underwriters Laboratory Inc. (UL) safety requirements, the power from any port must
be limited to 25 W (5 A at 5 V). Overcurrent protection may be implemented on a
global or individual basis.
Assuming a 5 V
±
3 % power supply, the worst-case supply voltage is 4.85 V. This
only allows a voltage drop of 100 mV across the hub Printed-Circuit Board (PCB) to
each downstream connector. This includes a voltage drop across the:
Power supply connector
Hub PCB (power and ground traces, ferrite beads)
Power switch (FET on-resistance)
Overcurrent sense device.
The PCB resistance and power supply connector resistance may cause a drop of
25 mV, leaving only 75 mV as the voltage drop allowed across the power switch and
overcurrent sense device. The individual voltage drop components are shown in
Figure 5
.
For global overcurrent detection, an increased voltage drop is needed for the
overcurrent sense device (in this case, a low-ohmic resistor). This can be realized by
using a special power supply of 5.1 V
±
3 %, as shown in
Figure 6
.
(1) Includes PCB traces, ferrite beads, and so on.
Fig 5.
Typical voltage drop components in the self-powered mode using individual overcurrent detection.
5 V
POWER SUPPLY
±
3 % regulated
+
4.85 V (min)
004aaa261
low-ohmic
PMOS switch
ISP1520
power switch
(PSWn_N)
VBUS
D
+
D
GND
SHIELD
4.75 V (min)
downstream
port
connector
hub board
resistance
voltage drop
25 mV
voltage drop
75 mV
(1)
(1) Includes PCB traces, ferrite beads, and so on.
Fig 6.
Typical voltage drop components in the self-powered mode using global overcurrent detection.
5.1 V KICK-UP
POWER SUPPLY
±
3 % regulated
+
4.95 V (min)
004aaa262
low-ohmic
PMOS switch
ISP1520
power switch
(PSWn_N)
VBUS
D
+
D
GND
SHIELD
4.75 V (min)
downstream
port
connector
hub board
resistance
voltage drop
25 mV
voltage drop
75 mV
low-ohmic
sense resistor
for overcurrent
detection
voltage drop
100 mV
(1)
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ISP1520BD,518 | 功能描述:USB 接口集成電路 USB2 4 PORT HUB RoHS:否 制造商:Cypress Semiconductor 產(chǎn)品:USB 2.0 數(shù)據(jù)速率: 接口類型:SPI 工作電源電壓:3.15 V to 3.45 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WLCSP-20 |
| ISP1520BD,551 | 功能描述:USB 接口集成電路 USB2 4-PORT HUB CTRLR RoHS:否 制造商:Cypress Semiconductor 產(chǎn)品:USB 2.0 數(shù)據(jù)速率: 接口類型:SPI 工作電源電壓:3.15 V to 3.45 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WLCSP-20 |
| ISP1520BD,557 | 功能描述:USB 接口集成電路 DO NOT USE ORDER -S OR -T PART RoHS:否 制造商:Cypress Semiconductor 產(chǎn)品:USB 2.0 數(shù)據(jù)速率: 接口類型:SPI 工作電源電壓:3.15 V to 3.45 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WLCSP-20 |
| ISP1520BD518 | 制造商:ST-Ericsson 功能描述:IC CONTROLLER USB HUB 64-LQFP |
| ISP1520BDGA | 功能描述:IC USB HUB CONTROLLER HS 64-LQFP RoHS:是 類別:集成電路 (IC) >> 接口 - 專用 系列:- 標(biāo)準(zhǔn)包裝:3,000 系列:- 應(yīng)用:PDA，便攜式音頻/視頻，智能電話 接口:I²C，2 線串口 電源電壓:1.65 V ~ 3.6 V 封裝/外殼:24-WQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:24-QFN 裸露焊盤（4x4） 包裝:帶卷 (TR) 安裝類型:表面貼裝 產(chǎn)品目錄頁面:1015 (CN2011-ZH PDF) 其它名稱:296-25223-2 |
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