Common DC/DC Converter Questions and Answers From Torex
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Why is the DC/DC converter more effective than the voltage regulator?
In voltage regulators, the Pch MOSFET acts as a variable resistance, and the power loss can be calculated by the multiplication of the flowing current with the input-output differential voltage. In DC/DC converters, the power loss is reduced by the switching operation to gain a high efficiency with the help of inductor energy storage. Since DC/DC converters are composed of several functional elements, it is important to reduce each element resistance for a higher efficiency.
Why is a coil required for DC/DC?
Answer
When voltage is applied to the both sides of a coil, the current which flows into the coil increases linearly in proportion to time, and the current in the coil continues to flow even though the switch is turned OFF. The coil plays the role of maintaining the voltage which flows into the CIN and CL to a constant using this characteristic.
What is the ripple voltage of DC/DC?
When the output voltage waveform is observed, the switching noise can be seen and its one of the components is the ripple voltage.
Since this is a change of voltage when the coil current is smoothened by a CL capacitor, the frequency becomes equal to the frequency of the switching operation.
The approximate level of the ripple voltage can be acquired by the product of the ESR of the coil current value and the CL capacitor.
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About Symmetry Electronics
Established in 1998, Symmetry Electronics, a Division of Braemac, is a global distributor of electronic components and systems. Combining premier components and comprehensive value-added services with an expert in-house engineering team, Symmetry supports engineers in the design, development, and deployment of a broad range of connected technologies.
Exponential Technology Group Member
Acquired by Berkshire Hathaway company TTI, Inc. in 2017, Symmetry Electronics is a proud Exponential Technology Group (XTG) member. A collection of specialty semiconductor distributors and engineering design firms, XTG stands alongside industry leaders TTI Inc., Mouser Electronics, and Sager Electronics. Together, we provide a united global supply chain solution with the shared mission of simplifying engineering, offering affordable technologies, and assisting engineers in accelerating time to market. For more information about XTG, visit www.xponentialgroup.com.