MB39C011APFT-G-BND-ERE1 Datasheet, PDF (20/53 Pages) Cypress Semiconductor – 2 ch DC/DC Converter IC with Synchronous Rectification

MB39C011A
9. Switching Scheme Selection
This device can operate even by a synchronous rectification and an asynchronous rectification. There is superiority or
inferiority respectively. Select the switching type considering the features as a guide.
Switching type
Asynchronous rectification
Synchronous rectification
Parts
P-ch FET  Fly-back diode
P-ch FET  N-ch FET
P-ch FET  N-ch FET  Fly-back
diode
Feature
■ Superior cost advantages
■ Under large load currents and low output voltages, it is inefficient because
generation of heat of the Fly-back diode (SBD) is large.
■ Offers a balance between cost and efficiency.
■ Supports large load currents and low output voltages
■ Emphasis on efficiency (particularly effective at high oscillator
frequencies)
■ Supports large load currents and low output voltages
■ Because of the increased number of parts, the cost is a disadvantage.
Document Number: 002-08369 Rev. *A
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