2009/11/04 ver.2 page 1 sp6018 synchronous rectifier driver description applications the fundamental of sp6018 synchronous rectifier (sr) driver ic is based on our u.s. p atented methods that utilize the principle of ?prediction? logic circuit. the ic deliberatesprevious cycle timing to control the sr in present cycle by ?predictive? algorithm that makes adjustments to the turn-off time, in order to achieve maximum efficiency and avoid cross-conduction at the same time. specially, sp6018 is designed for resonance. it also maintains the mosfet?s body diode conduction at minimum level. the sp6018 is capable to adapt in almost all existing adaptors with few adjustments considered necessary. ? servers & workstations ? storage area network power supplies ? telecommunication converters ? embedded systems ? industrial & commercial systems using high current processors features pin configuration (sop-8) part marking ? offers efficiency improvement over schottky diode (depends on drive configuration of the sr). ? drives all power mosfet. ? prediction gate timing control. ? minimum mosfet body diode conduction. ? operating frequency up to 400 khz. ? synchronize to transformer secondary voltage waveform.
2009/11/04 ver.2 page 2 sp6018 synchronous rectifier driver typical applcation circuit pin description pin symbol description 1 timing discontinuous current filter timi ng adjustment resistor connection. 2 pred capacitor to store previous cycle timing for sr mosfet. 3 vr voltage regulator. 4 adj trigger point adjustment for dynamic state. 5 gnd ground connection. 6 mosg-c catch mosfet gate drive. 7 vdd dc supply voltage. 8 sync synchronized signal from the v ds of sr mosfet.
2009/11/04 ver.2 page 3 sp6018 synchronous rectifier driver block diagram ordering information part number package part marking SP6018S8RGB sop-8 sp6018 i sp6018s8tgb sop-8 sp6018 i SP6018S8RGB : 7? tape reel ; pb ? free ; halgon ? free sp6018s8tgb : tube ; pb ? free ; halgon ? free absoulte maximum ratings (ta=25 , unless otherwise specified.) the following ratings designate persistent limits beyond which damage to the device may occur . symbol parameter value unit v dd dc supply voltage 16 v i out peak source current (pulsed) 1 a peak sink current (pulsed) 1 a p d power dissipation @ t a =85 (*) 0.25 w t j operating junction temperature range -40 to125 t stg storage temperature range -40 to 150 t lead lead soldering temperature for 5 sec. 260
2009/11/04 ver.2 page 4 sp6018 synchronous rectifier driver thermal resistance symbol parameter value unit r ? jc thermal resistance junction ? case (*) 45 /w (*) the power dissipation and thermal resistance are evalua ted under copper board mounted with free air conditions. electrical characteristics (t a =25 , v dd =12v, freq. =300 khz, duty cycle=50%, unless otherwise specified.) symbol parameter conditions min. typ. max. unit supply input no load 4 7 ma i dd supply current v sync =0v, no load 5 8 ma vdd supply voltage idd peak < 2a 16 v vdd on enable voltage 9.0 10.0 11.0 v sync reference (sync) vshth sync high threshold 3.9 v vslth sync low threshold 0.9 v vsync sync clamp voltage isync=3ma 5 v isync sync input current 3 ma voltage regulator reference (vr) i vr vr output current 20 ma on time duty setup ( pin 6 ) t on-time 20 us mosfet gate driver (mosg-c) voh output high voltage io = -200ma 10.5 11 v vol output low voltage io = 200ma 0.5 0.8 v td propagation delay no load 50 80 ns tpred no load 120 ns tr rise time no load 10 25 ns tf fall time no load 10 25 ns dynamic protect dt dynamic variable pin 4 open 600 ns ton-min mosg-c on time pwm adjusts time > dt 1 us (*) tr & tf are measured among 10% an d 90% of starting and final voltage.
2009/11/04 ver.2 page 5 sp6018 synchronous rectifier driver performance characteristics (t a =25 , unless otherwise specified.) *fig. 1 : no load ; no sync *fig. 4~5 : frequency = 100 khz.
2009/11/04 ver.2 page 6 sp6018 synchronous rectifier driver sop- 8 package outline
2009/11/04 ver.2 page 7 sp6018 synchronous rectifier driver information provided is alleged to be exact and consistent. sync power corporation presumes no responsibility for the penalties of use of such information or for any violation of pa tents or other rights of third parties, which may result from it s use. no license is granted by allegation or otherwise under any pate nt or patent rights of sync power corporation. conditions mentioned in this publication ar e subject to change without notice. this p ublication surpasses and replaces all information previously supplied. sync power corporation products are not authorized for use as critical components in life support devices or systems without express written approval of sync power corporation. ?the sync power logo is a registered trademark of sync power corporation ?2004 sync power corporation ? printed in taiwan ? all rights reserved sync power corporation 7f-2 , no. 3-1 , park street nankang district (nksp), taipei, taiwan, 115, r.o.c phone: 886-2-2655-8178 fax: 886-2-2655-8468 http://www.syncpower.com
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