Power Pulse Generator THE LM150/LM250/LM350

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. 

Specifications - FR107

FR107

High current capability High surge current capability High reliability Low reverse current Low forward voltage drop Fast switching for high efficiency

* Case : DO-41 Molded plastic * Epoxy : UL94V-O rate flame retardant * Lead : Axial lead solderable per MIL-STD-202, Method 208 guaranteed * Polarity : Color band denotes cathode end * Mounting position : Any * Weight : 0.34 gram

Rating 25 °C ambient temperature unless otherwise specified. Single phase, half wave, 60 Hz, resistive or inductive load. For capacitive load, derate current by 20%.

Maximum Recurrent Peak Reverse Voltage Maximum RMS Voltage Maximum DC Blocking Voltage Maximum Average Forward Current 0.375"(9.5mm) Lead Length 55 °C Peak Forward Surge Current, 8.3ms Single half sine wave Superimposed on rated load (JEDEC Method) Maximum Peak Forward Voltage = 1.0 Amp. Maximum DC Reverse Current at Rated DC Blocking Voltage 100 °C

Maximum Reverse Recovery Time ( Note 1 ) Typical Junction Capacitance ( Note 2 ) Junction Temperature Range Storage Temperature Range

1 ) Reverse Recovery Test Conditions 1.0 A, Irr 2 ) Measured at 1.0 MHz and applied reverse voltage of 4.0 VDC
FIG.1 - REVERSE RECOVERY TIME CHARACTERISTIC AND TEST CIRCUIT DIAGRAM

NOTES : 1. Rise Time 7 ns max., Input Impedance = 1 megaohm, 22 pF. 2. Rise time 10 ns max., Source Impedance = 50 ohms. 3. All Resistors = Non-inductive Types.
FIG.3 - MAXIMUM NON-REPETITIVE PEAK FORWARD SURGE CURRENT PEAK FORWARD SURGE CURRENT, AMPERES
AMBIENT TEMPERATURE, ( °C) FIG.4 - TYPICAL FORWARD CHARACTERISTICS REVERSE CURRENT, MICROAMPERES

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This is the MMBT3904 NPN SMT Transistor Design Kit. It includes the very popular SMT version of the 2N3904, General Purpose NPN Transistor: MMBT3904. This was one of the most popular transistors used in all kinds of circuits for years and years. It was designed for general purpose amplifiers with a 500 milliamp Collector current requirement. This kit also includes a few pieces of the MMBT3906 (PNP) which is the complement to the MMBT3904 (NPN) and a SMT Voltage Regulator, LM317M in the SMT package. 


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