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STMPS2141 bảng dữ liệu(PDF) 8 Page - STMicroelectronics

tên linh kiện STMPS2141
Giải thích chi tiết về linh kiện  Enhanced single channel power switches
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
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STMPS2141 bảng dữ liệu(HTML) 8 Page - STMicroelectronics

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Functional description
STMPS2141, STMPS2151, STMPS2161, STMPS2171
8/30
3
Functional description
3.1
Fault blanking
The STMPS devices feature a 10 ms fault blanking. Fault blanking allows current-limit faults,
including momentary short-circuit faults that occur when hot-swapping a capacitive load,
and also ensures that no fault is issued during power-up. When a load transient causes the
device to enter current limit, an internal counter starts. If the load fault persists beyond the
10 ms fault-blanking timeout, the FAULT output asserts “low”. Load-transient faults less than
10 ms (typ.) do not cause a FAULT output assertion. Only current-limit faults are blanked.
Die over-temperature faults and input voltage drops below the UVLO threshold cause an
immediate fault output.
3.2
Overcurrent/over-temperature protection
In overcurrent or short-circuit condition, the switch limits the current at a value of about
120% of the rated current. If the temperature of the die goes above the limit value, the switch
turns off.
3.3
FAULT conditions
In applications of power switch, 3 types of FAULT conditions are common. These fault
conditions and the response of STMPS21x1 power switches are described in the following
table.
Table 3.
FAULT conditions
Fault
Condition
STMPS21x1 action
Short circuit
Output shorted to GND via resistance
path of < 1
Ω, causing a rapid current
surge
Turn off output until short is removed,
assert FAULT pin
Over-current
Output connected to a load that sinks
current above threshold
Reduces output voltage to reduce the
current. Assert FAULT pin after a blanking
period
Overheating
Temperature of junction exceeds 135°C
due to any reason
Turn OFF output until temperature falls
below 125°C. Asserts FAULT pin
immediately


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