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TS2021 bảng dữ liệu(PDF) 4 Page - Taiwan Semiconductor Company, Ltd

tên linh kiện TS2021
Giải thích chi tiết về linh kiện  0.5A Single Channel USB Power Switch
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nhà sản xuất  TSC [Taiwan Semiconductor Company, Ltd]
Trang chủ  http://www.taiwansemi.com
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TS2021
0.5A Single Channel USB Power Switch
4/8
Version: A11
Application Information
Flag Output
An error Flag is an open-drained output of an N-channel MOSFET. Flag output is pulled low to signal the following
fault conditions: input under-voltage, output current limit, and thermal shutdown. The current limit flag response
delay time is 9ms.
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
error flag signals when any current limit conditions occur.
Thermal Shutdown
When temperature of TS2021 exceeds 145ºC for any reasons, the thermal shutdown function turns MOSFET
switch off and signals the error flag. A hysteresis of 20ºC prevents the MOSFETs from turning back on until the
chip temperature drops below 125ºC.
Enable Control
Enable must be driven logic low for a clearly defined input. Floating the input may cause unpredictable operation
Under-Voltage Lockout
UVLO (under-voltage lockout) prevents the output MOSFET from turning on until input voltage exceeds 2.5V
typically. After the switch turns on, if the input voltage drops below 2.3V typically, UVLO shuts off the output
MOSFET.
Supply Filtering
A 1uF bypass capacitor from USB 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 22uF/10V
ceramic capacitor mounted close to downstream connect each port should provide transient drop protection
Printed Layout Circuit
The power circuitry of USB printed circuit boards requires a customized layout to maximize thermal dissipation and
to minimize voltage drop and EMI


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