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UC1108 Scheda tecnica(PDF) 5 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) 5 Page - Unisonic Technologies

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UC1108
Preliminary
CMOS IC
UNISONICTECHNOLOGIESCO.,LTD
5 of 8
www.unisonic.com.tw
QW-R103-098.a
OPERATION DESCRIPTION (Cont.)
Constant Current Operation
When the sampled voltage is below 4V reference voltage and the error amplifier output reaches its maximum,
thus UTC UC1108 operates in constant-current (CC) mode. The CC point and maximum output power can be
externally adjusted by external current sense resistor Rcs. The larger Rcs, the smaller CC point is, and the smaller
output power becomes.
Figure3. Adjustable output power by changing Rcs
Figure4. Secondary current waveform
In CC operation, the CC loop control function of UTC UC1108 will keep a fixed proportion between secondary
inductance de-magnetization time (Tdemag) and switching cycle time (Tsw). The fixed proportion is
7
4
=
Tsw
Tdemag
(2)
Thus the output current is given by:
Ipk
×
N
N
×
7
2
=
Tsw
Tdemag
×
Ipk
×
N
N
×
2
1
=
Iout
S
P
S
P
(3)
Current Sensing and Leading Edge Blanking
Cycle-by-cycle current limiting is offered in UTC UC1108. 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.
Drive BJT
The driver is a push pull stage with the supply voltage VCC. It provides the driving current for the external power
bipolar transistor. The output signal is current-limited to IOUT(SOURCE).


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