AN701 データシートの表示（PDF） - Vishay Semiconductors

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AN701

Designing High-Frequency DC-to-DC Converters With the Si9114A Switchmode Controller

Vishay Semiconductors 

The configuration of the forward converter transformer is as

follows (note the polarity/phasing of the windings):

L1

+

D1

C2

C1

D2

–

AN701

Vishay Siliconix

The above equations and calculations are supplied only as a

guide for the designer. In practical terms other factors will must

be considered, including the following:

S Effective required voltage adjustment range of output

S Losses in the primary side of the circuit, including the sense

resistor and the MOSFET voltage drops

S Losses in the secondary side of the circuit, including dc

losses in the output choke

S Forward voltage of the rectifier over load and temperature

S Interconnection losses, including remote sense drops

S OR-ing diode losses, if used in multiple converters.

Figure 29

Document Number: 70575

16-Jan-01

www.vishay.com

17

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