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LM2941S Scheda tecnica(PDF) 10 Page - Texas Instruments

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Il numero della parte LM2941S
Spiegazioni elettronici  1A Low Dropout Adjustable Regulator
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Produttore elettronici  TI1 [Texas Instruments]
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Current
Limit
Thermal
Shutdown
IN
OUT
GND
Bandgap
Reference
OVSD
(
30 V)
PNP
LM2941
ON/OFF
ADJ
LM2941, LM2941C
SNVS770I – JUNE 1999 – REVISED JANUARY 2015
www.ti.com
7 Detailed Description
7.1 Overview
The LM2941 positive voltage regulator features the ability to source 1 A of output current with a dropout voltage
of typically 0.5 V and a maximum of 1 V over the entire temperature range. Furthermore, a quiescent current
reduction circuit has been included which reduces the ground current when the differential between the input
voltage and the output voltage exceeds approximately 3 V. The quiescent current with 1 A of output current and
an input-output differential of 5 V is therefore only 30 mA. Higher quiescent currents only exist when the regulator
is in the dropout mode (VIN – VOUT ≤ 3 V).
7.2 Functional Block Diagram
7.3 Feature Description
7.3.1 Short-Circuit Current Limit
The internal current limit circuit is used to protect the LDO against high-load current faults or shorting events. The
LDO is not designed to operate in a steady-state current limit. During a current-limit event, the LDO sources
constant current. Therefore, the output voltage falls when load impedance decreases. Note also that if a current
limit occurs and the resulting output voltage is low, excessive power may be dissipated across the LDO, resulting
a thermal shutdown of the output.
7.3.2 Overvoltage Shutdown (OVSD)
Input voltage greater than typically 30 V will cause the LM2941 output to be disabled. When operating with the
input voltage greater than the maximum recommended input voltage of 26 V, the device performance is not
ensured. Continuous operation with the input voltage greater than the maximum recommended input voltage is
discouraged.
10
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Product Folder Links: LM2941 LM2941C


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