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LM3578AN Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM3578AN Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 20 page  LM2578A/LM3578A Switching Regulator General Description The LM2578A is a switching regulator which can easily be set up for such DC-to-DC voltage conversion circuits as the buck, boost, and inverting configurations. The LM2578A fea- tures a unique comparator input stage which not only has separate pins for both the inverting and non-inverting inputs, but also provides an internal 1.0V reference to each input, thereby simplifying circuit design and p.c. board layout. The output can switch up to 750 mA and has output pins for its collector and emitter to promote design flexibility. An external current limit terminal may be referenced to either the ground or the V in terminal, depending upon the application. In addi- tion, the LM2578A has an on board oscillator, which sets the switching frequency with a single external capacitor from <1 Hz to 100 kHz (typical). The LM2578A is an improved version of the LM2578, offer- ing higher maximum ratings for the total supply voltage and output transistor emitter and collector voltages. Features n Inverting and non-inverting feedback inputs n 1.0V reference at inputs n Operates from supply voltages of 2V to 40V n Output current up to 750 mA, saturation less than 0.9V n Current limit and thermal shut down n Duty cycle up to 90% Applications n Switching regulators in buck, boost, inverting, and single-ended transformer configurations n Motor speed control n Lamp flasher Connection Diagram and Ordering Information Dual-In-Line Package 00871129 Order Number LM3578AM, LM2578AN or LM3578AN See NS Package Number M08A or N08E February 2005 © 2005 National Semiconductor Corporation DS008711 www.national.com |
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