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UC3800G-S08-R датащи(PDF) 6 Page - Unisonic Technologies

номер детали UC3800G-S08-R
подробное описание детали  LOW COST POWER-SAVING MODE PWM CONTROLLER
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производитель  UTC [Unisonic Technologies]
домашняя страница  http://www.utc-ic.com
Logo UTC - Unisonic Technologies

UC3800G-S08-R датащи(HTML) 6 Page - Unisonic Technologies

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UC3800
Preliminary
LINEAR INTEGRATED CIRCUIT
UNISONICTECHNOLOGIESCO.,LTD
6 of 10
www.unisonic.com.tw
QW-R103-083.a
OPERATION DESCRIPTION
The UTC UC3800 devices integrate many useful designs into one controller for low-power switch-mode power
supplies. The following descriptions highlight some of the features of the UTC UC3800 series.
HV Start-up
UTC UC3800 integrated HV start circuit, and provide about 1mA current to charge VDD pin during power on state
from HV pin. When VDD cap voltage is higher than UVLO (OFF), the charge current is switched off. At this moment,
the VDD capacitor provides current to UTC UC3800 until the auxiliary winding of the main transformer starts to
provide the operation current.
Power-Saving Mode Operation
The proprietary Power-Saving Mode function provides linearly decreasing the switching frequency under
light-load conditions for higher efficiency. The feedback voltage, which is sampled from the voltage feedback loop, is
taken as the reference. Once the feedback voltage dropped below the threshold voltage, the switching frequency
starts to decrease. This Power-Saving Mode function dramatically reduces power consumption under light-load
conditions. The 22KHz minimum frequency control also eliminates the audio noise at any loading conditions.
At zero load condition, the magnitude of power loss is in proportion to the number of switching events within a
fixed period of time. Reducing switching events leads to the reduction on the power loss and thus conserves the
energy. The UTC UC3800 enter burst mode at standby condition to minimize the switching loss and reduces the
standby power consumption. Power supplies using the UTC UC3800 can easily meet even the strictest regulations
regarding standby power consumption.
Switch Frequency Set
The maximum switch frequency is fixed to 65KHz. Switch frequency is modulated by output power POUT during IC
operating. At no load or light load condition, most of the power dissipation in a switching mode power supply is from
switching loss on the MOSFET transistor, the core loss of the transformer and the loss on the snubber circuit. The
magnitude of power loss is in proportion to the number of switching events within a fixed period of time. So lower
switch frequency at lower load, which more and more improve IC’s efficiency at light load. At from no load to light
load condition, The IC will operate at from Burst mode to Reducing Frequency Mode. The relation curve between fSW
and POUT/POUT (MAX) as followed Fig.1.
Fig.1 The relation curve between fSW and relative output power POUT/ POUT (MAX)


Аналогичный номер детали - UC3800G-S08-R

производительномер деталидатащиподробное описание детали
logo
Unisonic Technologies
UC3800G-S08-R UTC-UC3800G-S08-R Datasheet
221Kb / 10P
   LOW COST POWER-SAVING MODE PWM CONTROLLER
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