Overview: In the first seminar (22 Jan
2003), we went through the basics of buck converters and related topics.
In this seminar we will be concentrating on practical aspects of using buck
converters in a low power or portable system. Expect lots of practical examples
and scope plots.
Length: 60 minutes
Published Date: August 2003
Topics covered in this online seminar include:
- Brief overview of buck converters
- Line and load transient response
- setup for measurement
- response vs. output capacitor
- response vs. crossover frequency (regulator bandwidth)
- simultaneous line & load transients
- Stability and frequency response
- setup for Bode plot measurement
- inferring stability from load transient
- response
subharmonic oscillations (how to identify and avoid)
- slope compensation
- bandwidth vs. Vout/Vref
- output capacitor vs. bandwidth
- feedback resistor values vs. loop gain & bandwidth
- Output ripple voltage
- common misconceptions
- ripple vs. output capacitance and switching frequency
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Presenters:
Frank De Stasi is a Principal Design Engineer with
National Semiconductor’s Portable Power Systems Group in Santa
Clara, California. |
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Mathew Jacob is a Staff Applications Engineer with National
Semiconductor’s Portable Power Systems Group in Santa Clara,
California. |
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