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UC3848L-S08-R Fiches technique(PDF) 6 Page - E-Tech Electronics LTD

No de pièce UC3848L-S08-R
Description  HIGH PERFORMANCE CURRENT MODE CONTROLLERS
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Fabricant  ETL [E-Tech Electronics LTD]
Site Internet  http://e-tech.com.hk
Logo ETL - E-Tech Electronics LTD

UC3848L-S08-R Fiches technique(HTML) 6 Page - E-Tech Electronics LTD

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UC3848
LINEAR INTEGRATED CIRCUIT
UNISONICTECHNOLOGIESCO.,LTD
6 of 11
www.unisonic.com.tw
QW-R103-033.F
FUNCTIONAL DESCRIPTION(Cont.)
(2) Switch Frequency Set
The maximum switch frequency is set to 68kHz. 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 subber 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.4.
FIG.4 The relation curve between fSW and relative output power POUT/ POUT (MAX)
(3) Internal Synchronized Slope Compensation
Built-in slope compensation circuit adds voltage ramp onto the current sense input voltage for PWM
generation, this greatly improves the close loop stability at CCM and prevents the sub-harmonic oscillation and thus
reduces the output ripple voltage.


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