STR-W6853 View Datasheet(PDF) - Sanken Electric co.,ltd.
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STR-W6853 Datasheet PDF : 5 Pages
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SANKEN ELECTRIC : News Release
high input voltage or light load condition. In order to resolve this
drawback, we have developed new "STR-W 6800 Series ICs" which is
able to hold 70kHz by the function of what is called "Multi-bottom
Skip Operation" (*1) when the high operating frequency exceeds
70kHz. By means of restraining the frequency of 70kHz, the efficiency
of about 79% will be guaranteed (at the time of electricity output of
10W), which is improved by 14 % compared with the conventional
ones.
When the load is light at the time of stand-by, "Time Fix Control
Operation" (*2) will operate and make input power less than 0.5W (at
the AC input 230V) by holding frequency less than around 2kHz (at
the output power of 0.05W), which ranks the technology of Sanken
top class among the competitors.
As explained, "STR-W 6800 Series ICs" guarantees high efficiency at
the wide areas from the heavy load to stand-by load by means of the
automatic change-over of the operation modes. The new series will
surely contribute to the save of power consumption as TV, VTR and
others are more and more high function and digitalized.
*1 "Multi-Bottom Skip Operation"
In usual Quasi-Resonant operation, operating frequency will be
high as load isgetting lighter. On the other hand, Multi-Bottom
Skip Operation makes the ceiling of operating frequency (fixed
operating frequency), prevents inefficiency and reduces switching
loss by turn-on at the bottom of fixed operating frequency like
Quasi-Resonant operation. In actual operation, the number of skip
to bottom, which depends on the load (operating frequency), will
be changed as the turn-on is done at the bottom after having
reached the fixed operating frequency.
*2 "Time Fix Control Operation"
At the time of stand-by load, when on-time is shorter than the
fixed time set inside, the on-time will output long forcibly and
output voltage will be stabilized with controlling change of load by
off-time. Moreover it makes operating frequency drastically low
and reduce switching loss.
< Features of STR-W6800 Series >
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