The LM78S40 is a monolithic regulator subsystem consisting of all the active building blocks necessary for switching regulator systems.
The device consists of a temperature compensated voltage reference, a duty-cycle controllable oscillator with an active current limit circuit, an error amplifier, high current, high voltage output switch, a power diode and an uncommitted operational amplifier.
Acquired by Texas Instruments on September 23rd, 2011.
Feature
The LM78S40 is a monolithic regulator subsystem consistingof 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, highcurrent, high voltage output switch, a power diode and anuncommitted operational amplifier.
The device can drive ex-ternal NPN or PNP transistors when currents in excess of1.5A or voltages in excess of 40V are required. The devicecan be used for step-down, step-up or inverting switchingregulators as well as for series pass regulators. It featureswide 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 inbattery operated systems.
·step-up, step-down or inverting switching regulators·Output adjustable from 1.25V to 40V
·Peak currents to 1.5A without external transistors
·Operation from 2.5V to 40V input
·Low standby current drain
·80 dB line and load regulation
·High gain, high current, independent op amp
·Pulse width modulation with no double pulsing
(Picture: Pinout)
