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AN701 Datasheet(PDF) 14 Page - Vishay Siliconix

Part No. AN701
Description  reduce the size of energy storage components
Download  19 Pages
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Maker  VISHAY [Vishay Siliconix]
Homepage  http://www.vishay.com
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AN701 Datasheet(HTML) 14 Page - Vishay Siliconix

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AN701
Vishay Siliconix
www.vishay.com
14
Document Number: 70575
16-Jan-01
Integrated high-voltage start circuit:
the depletion transistor circuit allows fast turn-on and
eliminates the need for extra components. At lower
frequencies and power levels, it is possible to omit the bias
winding completely, since circuit consumption is low, and the
depletion circuit behaves as a linear regulator.
Synchronization in phase and frequency:
is a necessary benefit for distributed power systems where
multiple converters are operated.
CONCLUSIONS
Operation at 500 kHz is possible using BiC/DMOS PWM
control circuits. Significant power savings are possible,
yielding high efficiencies and lower parts count due to the
integrated high-voltage start circuitry. Operation at high
frequencies allows the use of small, efficient, low-profile
energy storage components, with higher reliability and
calculated MTBFs. Surface mounted power MOSFETs are
easily assembled using conventional assembly techniques.
REFERENCES
1. Murakami, Noaki and Yamasaki, Mikio. “Analysis of a
Resonant Rest Condition for a Single Ended Forward
Converter.”
PESC88
Record
(April
1988)
CH
2523-9/88/0000-1018 $1.00
1988 IEEE.
2. Chryssis, George C. High Frequency Switching Power
Supplies: Theory and Design. 2nd. ed. New York: McGraw Hill.
3. “Designing DC/DC converters with the Si9110 Switched
Controller.” AN703. Vishay Siliconix Power Integrated Circuits
Data Book, 1999.
4. “Efficient ISDN Power Converters Using the Si9100.”
AN702. Vishay Siliconix Power Integrated Circuits Data Book,
1999.
1 The strange shape of the ripple needs to be further analyzed but could be explained as follows:
S The step voltage that appears at the same time as the voltage switching edges is caused entirely by the ESR, as it is the only possible cause
for a rapid step voltage across a capacitor. In this case, the measured value is on the order of 8 mV, thus predicting an ESR value of 6/0.3 = 20 m
W
for both devices. This is slightly higher than predicted, but of the same order of magnitude.
S The sinusoidal waveform must be caused by the equivalent capacitance that appears across the inductor, causing a capacitive coupling directly
into the output.


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