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UC1103 Scheda tecnica(PDF) 7 Page - Unisonic Technologies

Il numero della parte UC1103
Spiegazioni elettronici  HIGH PRECISION CC/CV PRIMARY SIDE SWITCHING REGULATOR
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Produttore elettronici  UTC [Unisonic Technologies]
Homepage  http://www.utc-ic.com
Logo UTC - Unisonic Technologies

UC1103 Scheda tecnica(HTML) 7 Page - Unisonic Technologies

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UC1103
Preliminary
CMOS IC
UNISONICTECHNOLOGIESCO.,LTD
7 of 9
www.unisonic.com.tw
QW-R502-961.d
OPERATION DESCRIPTION(Cont.)
Figure3. Adjustable output power by changing Rcs
Figure4. Secondary current waveform
In CC operation, the CC loop control function of UTC UC1103 will keep a fixed proportion between secondary
inductance de-magnetization time (Tdemag) and switching cycle time (Tsw). The fixed proportion is
2
1
=
Tsw
Tdemag
(2)
Thus the output current is given by:
Ipk
×
N
N
×
4
1
=
Tsw
Tdemag
×
Ipk
×
N
N
×
2
1
=
Iout
S
P
S
P
(3)
Programmable Cable Drop Compensation
UTC UC1103 has a built-in cable voltage drop compensation to achieve good load regulation. An offset voltage is
generated at VS pin by an internal current flowing into the resistor divider. The current is inversely proportional to the
voltage of COMR pin. As a result, it is inversely proportional to the output load current. The voltage drop across the
cable is compensated by this offset voltage at VS pin. It can also be programmed by adjusting the resistance of the
divider to compensate the drop for various cable lines used.
Current Sensing and Leading Edge Blanking
Cycle-by-cycle current limiting is offered in UTC UC1103. The switch current is detected by a sense resistor into
the CS pin. When the power switch is turned on, a turn-on spike will occur on this resistor. A 500ns leading-edge
blanking is built in to avoid false-termination of the switching pulse so that the external RC filtering is no longer
needed.


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