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參數資料
| 型號： | CM3511 |
| 廠商： | California Micro Devices Corporation |
| 英文描述： | Dual USB Overcurrent Switch 1.2A (VCC) / 200mA (VSBY) |
| 中文描述： | 雙USB過電流開關電流（虛擬通道連接）/ 200毫安（VSBY） |
| 文件頁數： | 1/13頁 |
| 文件大小： | 155K |
| 代理商： | CM3511 |
CALIFORNIA MICRO DEVICES
PRELIMINARY
CM3511
2002 California Micro Devices Corp. All rights reserved.
11/10/03
430 N. McCarthy Blvd, Milpitas, California 95035 Tel: (408) 263-3214 Fax: (408) 263-7846 www.calmicro.com
C0970500
1
Dual USB Overcurrent Switch 1.2A (V
CC
) / 200mA (V
SBY
)
Features
Dual outputs, each with independent over-current
protection circuitry and indicator
Supports standby mode in PCs so that a peripheral
can ramp down safely to a current <100mA
Up to 1.2A (V
) / 200mA (V
SBY
) continuous
current on each output
Over-current limits at 1.2A / 200mA respectively
10msec min fault blanking delay on OC# outputs
prevents false overcurrent alarms
Prevents backdrive current when host powered off
Low operating current (95
μ
A typ.)
Small 8-Lead SOIC package
Applications
PC motherboards, Notebooks, Set-Top-Boxes
The CM3511 also prevents backdrive current
flowing into the host from the connected peripheral.
This can occur when V
CC
is removed as the host
powers down, and the peripheral still has normal
power applied. The 5V from the peripheral can
therefore be linked to the host’s V
BUS
, potentially
causing backdrive current into the host and
overloading the peripheral power supply.
Pin Diagram
Product Description
California Micro Devices’ CM3511 is a dual port
USB overcurrent power switch that selects between
two independent 5V inputs available on a PC,
depending on the state of a logic input (SEL). The
device has two pairs of power switches, and each
pair is an analog “OR” function, providing a
continuous voltage at both outputs during power
transfer between inputs.
V
is the main 5V supply, which can be disabled in
a PC, and V
is the 5V standby supply which is
powered up whenever the PC has power. When the
‘SEL’ pin is at logic high, V
CC
is the assigned input
power supply. When ‘SEL’ is at logic low, V
is
used to power the output, and no current is taken
from V
CC
. Both switches can be deselected and
switched off by not driving (floating) the ‘SEL’ input,
which places the chip in low power mode.
Both pairs of switches have over-current protection.
Depending on whether ‘SEL’ is high or low, a current
over 1.2A or 200mA respectively out of either output
causes the device to enter a constant-current mode,
where the output voltage is progressively reduced to
prevent the current from increasing further. Each
output is independent of the other, so if one of the
switches is switched on but is not in overcurrent
mode then it will remain switched on. The OC#
output becomes active only if the overcurrent
condition exceeds a minimum continuous duration of
10ms.
If the overcurrent condition is severe enough that
the part heats up to the thermal limit T
MAX
, the switch
turns off and the temperature cools down to T
MIN
.
The switch then turns on again, and the device
heats up again, and so on, until the fault is removed.
Typical Application Circuit
Simplified Electrical Schematic
CP
OC1#
V
OUT1
OC2#
V
OUT2
V
CC
SEL
GND
V
SBY
SOIC-8
TOP
2 USB Ports
V
BUS
V
BUS
2 USB Ports
V
CC
SEL
GND
V
SBY
OC1#
V
OUT1
OC2#
V
OUT2
5V V
CC
5V V
SBY
Select V
CC
SEL
OC1#
V
OUT1
V
CC
H Over
current
protect
L Over
current
protect
OC2#
V
OUT2
V
SBY
H Over
current
protect
L Over
current
protect
CP
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相關代理商/技術參數 |
參數描述 |
|---|---|
| CM3512 | 制造商:CALMIRCO 制造商全稱:California Micro Devices Corp 功能描述:Dual USB Overcurrent 1.2A Switches with Independent Controls |
| CM3512-04SN | 制造商:CALMIRCO 制造商全稱:California Micro Devices Corp 功能描述:Dual USB Overcurrent 1.2A Switches with Independent Controls |
| CM3513 | 制造商:CALMIRCO 制造商全稱:California Micro Devices Corp 功能描述:USB 2.4A Overcurrent Switch |
| CM3513-04SN | 制造商:CALMIRCO 制造商全稱:California Micro Devices Corp 功能描述:USB 2.4A Overcurrent Switch |
| CM3518 | 制造商:CML 制造商全稱:Chicago Miniature Lamp,inc 功能描述:T-1 1/4 Special Midget Flange Base |
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