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SS6526-1CSTB датащи(PDF) 8 Page - Silicon Standard Corp.

номер детали SS6526-1CSTB
подробное описание детали  Dual USB High-Side Power Switch
Download  12 Pages
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производитель  SSC [Silicon Standard Corp.]
домашняя страница  http://www.siliconstandard.com
Logo SSC - Silicon Standard Corp.

SS6526-1CSTB датащи(HTML) 8 Page - Silicon Standard Corp.

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10/23/2007 Rev.1.00
www.SiliconStandard.com
8
APPLICATION INFORMATION
Error Flag
An error Flag is an open-drained output of an
N-channel MOSFET. FLG output is pulled low to
signal
the
following
fault
conditions:
input
undervoltage, output current limit, and thermal
shutdown.
Current Limit
The current limit threshold is preset internally. It
protects the output MOSFET switches from
damage resulting from undesirable short circuit
conditions or excess inrush current, which is
often encountered during hot plug-in. The low
limit of the current limit threshold of the
SS6526
allows a minimum current of 0.6A through the
MOSFET switches. The error flag signals when
any current limit conditions occur.
Thermal Shutdown
When temperature of
SS6526 exceeds 135°C
for any reasons, the thermal shutdown function
turns both MOSFET switches off and signals the
error flag. A hysteresis of 10
°C prevents the
MOSFETs from turning back on until the chip
temperature drops below 125
°C. However, if
thermal
shutdown
is
triggered
by
chip
temperature rise resulting from overcurrent fault
condition of either one of the MOSFET switches,
the thermal shutdown function will only turn off
the switch that is in overcurrent condition and
the other switch can still remain its normal
operation. In other words, the thermal shutdown
function of the two switches is independent of
each other in the case of overcurrent fault.
Supply Filtering
A 0.1
µF to 1µF bypass capacitor from IN to GND,
located
near
the
device,
is
strongly
recommended
to
control
supply
transients.
Without a bypass capacitor, an output short may
cause sufficient ringing on the input (from supply
lead inductance) to damage internal control
circuitry.
Transient Requirements
USB supports dynamic attachment (hot plug-in)
of peripherals. A current surge is caused by the
input capacitance of downstream device. Ferrite
beads are recommended in series with all power
and
ground connector
pins.
Ferrite
beads
reduce EMI and limit the inrush current during
hot-attachment
by
filtering
high-frequency
signals.
Short Circuit Transient
Bulk
capacitance
provides
the
short-term
transient
current
needed
during
a
hot-attachment event. A 33
µF/16V tantalum or a
100
µF/10V electrolytic capacitor mounted close
to downstream connector each port should
provide transient drop protection.
Printed Circuit Layout
The power circuitry of USB printed circuit boards
requires a customized layout to maximize
thermal dissipation and to minimize voltage drop
and EMI.
SS6526


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