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UC1108 Scheda tecnica(PDF) 6 Page - Unisonic Technologies |
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UC1108 Scheda tecnica(HTML) 6 Page - Unisonic Technologies |
6 / 8 page 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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