MB39C011A datasheet(20/53 Pages) CYPRESS

Part #	MB39C011A

Description	2ch DC/DC Converter IC with Synchronous Rectification Datasheet

PDF	53 Pages

Scroll/Zoom	100%

Manufacturer	CYPRESS [Cypress Semiconductor]

Direct Link	http://www.cypress.com

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20 / 53 page

Document Number: 002-08369 Rev. *B

Page 20 of 53

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

Parts

Feature

Asynchronous rectification

P-ch FET

+ Fly-back diode

■ 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.

Synchronous rectification

P-ch FET

+ N-ch FET

■ Offers a balance between cost and efficiency.

■ Supports large load currents and low output voltages

P-ch FET

+ N-ch FET + Fly-back

diode

■ 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.

MB39C011A Datasheet(PDF) 20 Page - Cypress Semiconductor