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LM78S40J/883 Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM78S40J/883 Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 10 page  LM78S40 Universal Switching Regulator Subsystem General Description The LM78S40 is a monolithic regulator subsystem consisting of all the active building blocks necessary for switching regu- lator systems. The device consists of a temperature com- pensated voltage reference, a duty-cycle controllable oscilla- tor with an active current limit circuit, an error amplifier, high current, high voltage output switch, a power diode and an uncommitted operational amplifier. The device can drive ex- ternal NPN or PNP transistors when currents in excess of 1.5A or voltages in excess of 40V are required. The device can be used for step-down, step-up or inverting switching regulators as well as for series pass regulators. It features wide supply voltage range, low standby power dissipation, high efficiency and low drift. It is useful for any stand-alone, low part count switching system and works extremely well in battery operated systems. Features n Step-up, step-down or inverting switching regulators n Output adjustable from 1.25V to 40V n Peak currents to 1.5A without external transistors n Operation from 2.5V to 40V input n Low standby current drain n 80 dB line and load regulation n High gain, high current, independent op amp n Pulse width modulation with no double pulsing Block and Connection Diagrams DS010057-2 16-Lead DIP DS010057-1 Top View April 1998 © 1998 National Semiconductor Corporation DS010057 www.national.com |
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