LM1758 A Switching Regulator Circuit

The National Semiconductor LM 1578 A is a switching regulator which can simply be created for such dc-to-dc voltage, conversion circuits as the buck, boost, and inverting configurations. The LM 1578 A features a unique comparator input stage that not only has separate pins for each the inverting and non-inverting inputs, however also provides an internal 1.0 V reference to every input, thereby simplifying circuit design and pc board layout.

The output can switch upto 750 m A and has output pins for its collector and emitter to promote design flexibility. An external current limit terminal is also referenced to either the ground or the Vin terminal, relying upon the application. additionally, the LM 1578 A has an on board oscillator, that sets the switching frequency with one external capacitor from < 1 Hz to 100 kHz (typical). It operates from supply voltages of 2 V to 40 V. it's supplied with current limit and thermal shutdown. Duty cycle up to 90 %. functional diagram is given in figure.