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| U3848 Datasheet, PDF (6/12 Pages) Unisonic Technologies – HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS | |||
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UC3848
LINEAR INTEGRATED CIRCUIT
 FUNCTIONAL DESCRIPTION(Cont.)
(2) Switch Frequency Set
The maximum switch frequency is 68KHz. The switch frequency is also modulated by output power POUT during IC
operating. Lower switch frequency at lower load can improve ICâs standby efficiency. Switch frequency is decreased
minimum at no load, then the UC3848 will operate at Power-Saving mode for Lower standby power. The relation
curve between fSW and POUT as followed FIG.4.
FIG.4 The relation curve between fSW and output power POUT
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
6 of 12
QW-R103-033,C
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