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STRF6676 Datasheet(PDF) 14 Page - Allegro MicroSystems

Part No. STRF6676
Description  OFF-LINE QUASI-RESONANT FLYBACK SWITCHING REGULATORS
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Maker  ALLEGRO [Allegro MicroSystems]
Homepage  http://www.allegromicro.com
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STRF6676 Datasheet(HTML) 14 Page - Allegro MicroSystems

 
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Series STR-F6600
OFF-LINE
QUASI-RESONANT FLYBACK
SWITCHING REGULATORS
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
14
TM
Capacitors
Electrolytic capacitors carrying large switching fre-
quency ripple currents (C1 and the output capacitors)
should be capable of handling the high rms currents
involved. Capacitors with low ESR are suitable. The
quasi-resonance capacitor C4 should be a high-voltage
ceramic type suitable for pulsed current operation.
The safety critical nature of the off-line application
must be considered when selecting both X and Y capaci-
tors for common- and differential-mode noise filtering.
Use of the low-noise quasi-resonant Series STR-F6600
will allow optimization of these capacitor values.
C5, the 470 pF filtering capacitor should be a 50 V
temperature-stable (COG) ceramic type.
Resistors
Resistor R5 carries high-frequency current, and so a low
internal inductance type of 1 W rating should be used.
Resistor R9 (R
S) should be 2 W metal oxide.
All other resistors can be 1/4 watt or 1/2 watt metal
film.
Diodes
Diodes carrying the high-frequency flyback currents
(such as the transformer rectifier diodes) should have a fast
or ultrafast reverse-recovery characteristic, adequate
current handing and peak reverse-voltage rating. Allegro/
Sanken supplies a range of suitable diodes, and these are
described in the Allegro/Sanken short-form catalogue
(AMS-127) or latest issue of Bulletin D01EC0.
Optocoupler
Both Toshiba TLP 621 and Siemens SFH 610A2 or
615A2 are suitable. A current-transfer ratio of 50% to
200% is acceptable.
Error Amplifier
A standard TL431 transconductance amplifier or an
Allegro/Sanken Series SE error-amplifier IC can be used.
The Series SE is particularly well-suited to high-voltage
(70 V to 140 V) power outputs.
If a Series SE error-amplifier IC is used, normally phase
compensation is not required. Should additional high-
frequency attenuation be required, a capacitor (0.022
µF or
less) can be connected across the primary side (collector-
emitter) of the optocoupler, a diode to maintain quasi-
resonant operation should be added in series with the
phototransistor emitter.
Applications Information
The products described here are manufactured in Japan by Sanken
Electric Co., Ltd. for sale by Allegro MicroSystems, Inc.
Sanken Electric Co., Ltd. and Allegro MicroSystems, Inc. reserve the
right to make, from time to time, such departures from the detail
specifications as may be required to permit improvements in the
performance, reliability, or manufacturability of their products.
Therefore, the user is cautioned to verify that the information in this
publication is current before placing any order.
These products are not authorized for use as critical components in
life-support appliances, devices, or systems without express written
approval.
The information included herein is believed to be accurate and
reliable. However, Sanken Electric Co., Ltd. and Allegro
MicroSystems, Inc. assume no responsibility for its use; nor for any
infringements of patents or other rights of third parties which may
result from its use.


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