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UC1108 Scheda tecnica(PDF) 4 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) 4 Page - Unisonic Technologies

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UC1108
Preliminary
CMOS IC
UNISONICTECHNOLOGIESCO.,LTD
4 of 8
www.unisonic.com.tw
QW-R103-098.a
OPERATION DESCRIPTION
The UTC UC1108 is a primary control unit for switch mode charger and adapter applications. It operates in
primary-side sensing and regulation. Opto-coupler and TL431 could be eliminated. Proprietary built-in CV and CC
control can achieve high precision CV/CC performance. It uses Pulse Frequency Modulation (PFM) method to build
discontinuous conduction mode (DCM) flyback power supplies.
Startup control
The voltage regulator provides the internal power supply VDD. For VCC and VDD external capacitors are required.
The current biasing of UTC UC1108 is adjustable by an external resistor. Internal time constants, thresholds and the
output current depend from the value of this resistor. The startup circuit activates the IC after startup and deactivates
the IC in case of UVLO.
Operating Current
The Operating current of UTC UC1108 is as low as 400uA. Good efficiency and very low standby power can be
achieved.
Constant Voltage Operation
The output voltage is defined by the transmission ratio between the secondary and auxiliary winding. The UTC
UC1108
captures the auxiliary winding feedback voltage at FB pin and operates in constant-voltage (CV) mode to
regulate the output voltage. The auxiliary voltage reflects the output voltage is given by:
)
V
+
V
(
×
N
N
=
V
O
S
A
AUX
(1)
Where V indicates the drop voltage of the output diode.
Figure2. Auxiliary voltage waveform
Via a resistor divider connected between the auxiliary winding and FB, the VAUX is sampled at the Tsampling end
and it is hold until the next sampling. The sampled voltage is compared with 4V reference voltage and the error is
amplified. The error amplifier output reflects the load condition and controls the Toff time to regulate the output
voltage, thus constant output voltage can be achieved.


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