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Lab 4 - 2B 2010

Lab 4 - 2B 2010 - ECE 2B Lab#4 Lab 4 Transistor Switching...

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1 © Bob York ECE 2B Lab #4 Lab 4 Transistor Switching Circuits Overview This lab continues our exploration of basic transistor switching circuits. We will examine some considerations for driving capacitive and inductive loads, and put this to use in creating a simple DC fan driver and DC-DC Boost converter. In the process we will apply and observe much of what you have learned in about 1 st and 2 nd -order circuit responses. Table of Contents Pre-lab Preparation 2 Before Coming to the Lab 2 Parts List 2 Background information 3 Constant-Current Charging of Capacitors 3 Measuring Rise-Time in Switching Waveforms 3 Switching Response of RLC Load 4 In-Lab Procedure 6 4.1 Driving Capacitive Loads 6 BJT Inverter 6 CMOS Inverter (Optional, for Extra Credit) 7 4.2 Inductive Loads 8 Ringing Response 8 Inductive Spiking and Diode Clamp 8 Motor Driver Circuit 9 4.3 DC-DC “Boost” Converter 10
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