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| EUP9291 ds9291 ver1.0 jan. 2017 1 synchronous rectifier controller description the EUP9291 is a high performance controller used t o secondary side synchronous rectifier (sr). the fundamental of EUP9291 is utilized n-channel mosfet power devices used for secondary side synchronous to emulate a near-ideal diode rectifier . this method not only directly reduces power dissipation of the rectifier but also reduces primary side losses as w ell. the EUP9291 is applied voltage-second balancing control method and not directly connected to the mosfet drain, so it is ideal for flyback power supp lies over the wide-output voltage range. the sr drive turn-off threshold is not related to the mosfet rds (on), which allows optimizing for maximum conduction time . it is compatible with dcm, tm and ccm operation typical application circuit features secondary-side sr optimized controller for 5v to 24v flyback systems volt-second balance sr on-time control compatible with primary-side and second-side control ccm operation compatibility short pin fault protection available in sop-8 and sot23-6 packages rohs compliant and 100% lead (pb)-free halogen-free applications switching mode power supply(dcm, tm and ccm) chargers for smart phones and tablets high efficiency auxiliary power in server desktop and appliance application figure 1. sop-8 typical application
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