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UC1108 Scheda tecnica(PDF) 6 Page - Unisonic Technologies

Il numero della parte UC1108
Spiegazioni elettronici  LOW-POWER OFF-LINE PRIMARY SIDE REGULATION CONTROLLER
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Produttore elettronici  UTC [Unisonic Technologies]
Homepage  http://www.utc-ic.com
Logo UTC - Unisonic Technologies

UC1108 Scheda tecnica(HTML) 6 Page - Unisonic Technologies

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UC1108
Preliminary
CMOS IC
UNISONICTECHNOLOGIESCO.,LTD
6 of 8
www.unisonic.com.tw
QW-R103-098.a
OPERATION DESCRIPTION (Cont.)
Output Cable Compensation
The UTC UC1108 senses the auxiliary winding feedback voltage at FB pin and operates in constant-voltage (CV)
mode to regulate the output voltage. In CV mode, FB pin voltage VFB is a constant of 4.0V. The CPR pin voltage
VCPR is generated by the internal circuit of UTC UC1108. It linearly decreases with the rise of the output load directly.
Where Dons is the duty cycle of secondary diode, and is equal to Tdemag/Tsw, which is directly proportional to the
output loading. The maximum Dtdemag is 4/7 and the minimal Dtdemag is close to zero in CV mode of UTC
UC1108
.
Protection Control
Good power supply system reliability is achieved with its comprehensive protection features including output
over-voltage protection, feedback loop open protection, Cycle-by-cycle current limiting, short circuit protection,
leading edge blanking and UVLO, etc.
VCC is supplied by transformer auxiliary winding output. The output of UTC UC1108 is shutdown when VCC drops
below VTH(OFF) and the power converter enters power on start-up sequence thereafter.


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