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Half-Bridge
Power Converter Design
Using the
LM5035
Presented by Steve Schulte
1
Hello! Welcome to National Semiconductor’s continuing series of On-Line Seminars
The topic of this presentation is the design of Half-Bridge Power Converters.
1
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Steve Schulte
Applications Engineer
Phoenix Design Center
Power Management Group
2
My name is Steve Schulte and I’m an applications engineer for the High Voltage
product line in the Power Management group.
2
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Presentation Outline
•
What is a Half-Bridge Converter
•
How Does a Half-Bridge Work
•
Loop Compensation
•
What are the Features of the LM5035
•
LM5035 Evaluation Board
•
Other Applications of the LM5035
3
© 2006 National Semiconductor Corporation
The first section of this seminar will describe the Half-Bridge topology and contrast it
with other topologies.
Next we’ll delve into the power flow through the transformer, the heart of the
converter.
Then loop compensation analysis and design process for a Type 3 compensator is
presented.
Following this, the features of the LM5035 Half-Bridge Controller and Driver are
reviewed, along with the reference design and a couple alternate uses for the
LM5035.
3
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Half-Bridge Description
4
First, what is a Half-Bridge converter?
4
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What is a Half-Bridge
Converter
•
Half-Bridge Converter is a Buck Topology with
Transformer-Isolation
•
Half the voltage stress compared to Forward
topology
•
Half the Transformer Volume compared to Forward
topology
•
Twice the effective switching frequency compared to
Forward topology
•
Up to 100% utilization of transformer
•
Used extensively in the 100W to 500W range,
possible up to 1000W
5
© 2006 National Semiconductor Corporation
The Half-Bridge topology is derived from the Buck converter family, which also
includes the Forward topology and the Full-Bridge topology. This family transfers
power from the primary to the secondary during the ‘on’ time, rather than storing
energy in the transformer as in the Flyback topology.
The Half-Bridge returns the core magnetizing energy to the input capacitors through
the MOSFETs, so a reset method required for Forwards is not necessary. The
Forward typically causes the MOSFET drain voltage to double the VIN during reset.
Forward uses the transformer in one direction, while Half-Bridge uses the core’s
entire B-H loop. This makes better use of the Half-Bridge core so the transformer
can be smaller for the same power level.
During the switching cycle the Forward drives one power pulse and Half-Bridge
drives two. The output filter components can be smaller for Half-Bridge due to this.
Forward needs at least 30% of the switching cycle for core reset, Half-Bridge can
use up to all the switching cycle.
Full-Bridge applies twice the voltage to the transformer compared to Half-Bridge, so
the current levels are more manageable at power levels greater that 1KW.
5
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