Transcription of Linear and Switching Voltage Regulator Fundamental Part 1
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Linear and Switching Voltage Regulator Fundamental Part 1
LM2940,LM2990,LM2991,LM309,LM317,LP2951, LP2952,LP2953,LP2954 Linear and Switching Voltage Regulator Fundamental Part 1 Literature Number: SNVA5581 National SemiconductorChester Simpson Member of Technical StaffPower Management ApplicationsLINEAR Voltage REGULATORSI ntroductionThe Linear Regulator is the basic building block of nearly every power supply used inelectronics. The IC Linear Regulator is so easy to use that it is virtually foolproof, andso inexpensive that it is usually one of the cheapest components in an paper will present information that gives the user greater understanding of howa Linear Regulator works, and will help to de-mystify Regulator specifications andapplications.
5 Allowing for the -55°C to +150°C temperature range, this minimum voltage requirement is usually set at about 2.5V to 3V by the manufacturer to guarantee specified performance limits. The voltage where the output actually falls out of regulation (called the dropout voltage) will probably be somewhere between 1.5V and 2.2V for a Standard regulator (it is dependent on both load current and ...
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