is a high performance offline psr power switch for low power ac/dc charger and adapter applications.
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.
● 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
● small power adapter
● cell phone charger
● digital cameras charger
● linear regulator/rcc replacement
