Power Pulse Generator THE LM150/LM250/LM350 is an adjustable voltage regulator capable of delivering from 1.2 to 33 volts at a maximum current of 3 amperes. Normally this chip is used in both fixed and adjustable power supplies, voltage regulators and voltage references. Since I'm always looking for a new way to obtain high-current pulses for flashing lamps and driving motors, motors, I have recently been experimenting with ways to switch the output of the LM350T on and off. Since the output voltage of this chip is fully adjustable, a circuit which switches its output on and off provides a variable- amplitude power pulse generator. Before looking at an LM350T power pulse generator, let's first examine the operating characteristics of this versatile chip. Figure 2-42 shows the pin diagrams for both the TO-220 packaged LM350T and the TO-3 versions of the LM150/LM250//LM350. The chip requires a minimum of external components.
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