Embedded Systems Conference
Breaking News
Newest First | Oldest First | Threaded View
User Rank
re: Current-boosted Buck converter supports high conversion ratio
LdI/dt   3/24/2009 6:46:02 PM
The circuit is intended for simple, non-isolated applications. The isolated flyback or single switch forward could certainly be used but not to any cost advantage due to additional voltage/current stress issues and generally more complex and/or additional magnetics. Tests performed on the circuit show a significant efficiency advantage over the conventional buck when low output voltages (high conversion ratios) are desired. The use of Schottky diodes or a synchronous rectifier for the freewheel diode additionally improves efficiency. EMI generation is significantly less than an isolated flyback or forward configuration. FC ON Semiconductor

User Rank
re: Current-boosted Buck converter supports high conversion ratio
rdrr   2/27/2009 11:53:13 PM
The relative FET withstand voltage must increase for a given voltage stress %. This increases its Rdson and thus its losses for a given FET voltage stress %. Also increased on time (increased duty cycle)conduction losses as switch + inductor must provide Volt-Second energy storage. This is offset by this designs primary side current reduction relative to output average current. also on the positive side of things the diode withstand voltage or synch rectifier withstand voltage is reduced allowing reduced freewheeling conduction losses. Has anybody workedthisout in spreadsheet (or Mathcad workbook) form to see if and where any efficiency gain are at and where the optimum sweet spot or range is located? Using different voltage withstanding diodes, switches and sync rectifiers?

Jim Stockton
User Rank
re: Current-boosted Buck converter supports high conversion ratio
Jim Stockton   2/19/2009 3:16:52 PM
Interesting article but with the inductor construction method pointed out there is little gain over a flyback topology or a single switch forward converter with a transformer instead.

Top Comments of the Week
Like Us on Facebook

Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)
EE Life
Frankenstein's Fix, Teardowns, Sideshows, Design Contests, Reader Content & More
Max Maxfield

My Mom the Radio Star
Max Maxfield
Post a comment
I've said it before and I'll say it again -- it's a funny old world when you come to think about it. Last Friday lunchtime, for example, I received an email from Tim Levell, the editor for ...

Bernard Cole

A Book For All Reasons
Bernard Cole
1 Comment
Robert Oshana's recent book "Software Engineering for Embedded Systems (Newnes/Elsevier)," written and edited with Mark Kraeling, is a 'book for all reasons.' At almost 1,200 pages, it ...

Martin Rowe

Leonard Nimoy, We'll Miss you
Martin Rowe
Like many of you, I was saddened to hear the news of Leonard Nimoy's death. His Star Trek character Mr. Spock was an inspiration to many of us who entered technical fields.

Rich Quinnell

Making the Grade in Industrial Design
Rich Quinnell
As every developer knows, there are the paper specifications for a product design, and then there are the real requirements. The paper specs are dry, bland, and rigidly numeric, making ...

Special Video Section
After a four-year absence, Infineon returns to Mobile World ...
A laptop’s 65-watt adapter can be made 6 times smaller and ...
An industry network should have device and data security at ...
The LTC2975 is a four-channel PMBus Power System Manager ...
In this video, a new high speed CMOS output comparator ...
The LT8640 is a 42V, 5A synchronous step-down regulator ...
The LTC2000 high-speed DAC has low noise and excellent ...
How do you protect the load and ensure output continues to ...
General-purpose DACs have applications in instrumentation, ...
Linear Technology demonstrates its latest measurement ...
Demos from Maxim Integrated at Electronica 2014 show ...
Bosch CEO Stefan Finkbeiner shows off latest combo and ...
STMicroelectronics demoed this simple gesture control ...
Keysight shows you what signals lurk in real-time at 510MHz ...
TE Connectivity's clear-plastic, full-size model car shows ...
Why culture makes Linear Tech a winner.
Recently formed Architects of Modern Power consortium ...
Specially modified Corvette C7 Stingray responds to ex Indy ...
Avago’s ACPL-K30T is the first solid-state driver qualified ...
NXP launches its line of multi-gate, multifunction, ...
EE Times Senior Technical Editor Martin Rowe will interview EMC engineer Kenneth Wyatt.
Flash Poll