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UPS602 Datasheet(PDF) 7 Page - Unisonic Technologies

Part # UPS602
Description  HIGH PERFORMANCE CURRENT MODE POWER SWITCH
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Manufacturer  UTC [Unisonic Technologies]
Direct Link  http://www.utc-ic.com
Logo UTC - Unisonic Technologies

UPS602 Datasheet(HTML) 7 Page - Unisonic Technologies

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UPS602
LINEAR INTEGRATED CIRCUIT
UNISONICTECHNOLOGIESCO.,LTD
7 of 12
www.unisonic.com.tw
QW-R119-005.I
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.
(4) Frequency Hopping For EMI Improvement
The Frequency hopping is implemented in the IC; there are two oscillators built-in the IC. The first oscillator
is to set the normal switching frequency; the switching frequency is modulated with a period signal generated by the
2nd oscillator. The relation between the first oscillator and the 2nd oscillator as followed FIG.5. So the tone energy is
evenly spread out, the spread spectrum minimizes the conduction band EMI and therefore eases the system design
in meeting stringent EMI requirement.
FIG.5 Frequency Hopping


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