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LM2941S Scheda tecnica(PDF) 10 Page - Texas Instruments |
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LM2941S Scheda tecnica(HTML) 10 Page - Texas Instruments |
10 / 30 page + 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 Submit Documentation Feedback Copyright © 1999–2015, Texas Instruments Incorporated Product Folder Links: LM2941 LM2941C |
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