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SP2678F

is a high performance offline PSR power switch for low power AC/DC charger and adapter applications.

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        SP2678F is a high performance offline PSR power switch for low power AC/DC charger and adapter applications. It operates in primary-side sensing and regulation. Thus, opto-coupler and TL431 are not required. In CC control,the output current and power setting can be adjustedexternally by the sense resistor R CS at CS PIN. In CVcontrol, multi-mode operations are utilized to achieve highperformance and high efficiency. In addition, good loadregulation is achieved by the built-in cable dropcompensation. SP2678F operates in PFM in CC mode,and it operates in PWM+PFM in CV mode with frequencyreduction at light/medium load. The chip consumes verylow operation current. It achieves less than 75mWstandby power to meet all global energy efficiencyregulations.

        SP2678F offers comprehensive protection coverage withauto-recovery feature including Cycle-by-Cycle currentlimiting, VDD over voltage protection (OVP), FB overvoltage protection, load short circuit protection, VDDunder voltage lockout (UVLO), Brown out protection , Lineover voltage protection ,OTP etc.

        SP2678F is offered in SOP7 packages.


典型應用框圖

功能

 ●  Less than 75mW standby power consumption at 230VAC with typical application circuit

 ●  Integrated 2A 680V MOSFET

 ●  Less than ±5% constant voltage and current regulation at universal AC input

 ●  Primary-side sensing and regulation without TL431 and opto-coupler

 ●  Adjustable constant current and output power setting

 ●  Compensates for input line voltage variations

 ●  Eliminates all control loop compensation circuitry

 ●  Start-up and static current as low as 5uA and 600uA.

 ●  Built-in Leading Edge Blanking(LEB)

 ●  Brown out protection and Line over voltage protection

 ●  Programmable cable voltage drop compensation

 ●  Multi-mode PWM and PFM operation for efficiency improving and audio noise free operation


應用

 ● Small Power Adapter

 ● Cell Phone Charger

 ● Digital Cameras Charger

 ● Linear Regulator/RCC Replacement


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