2010/01/ 05 ver.2 page 1 SP6012 synchronous rectifier driver description applications the fundamental of SP6012 synchronous rectifier (sr) driver ic is based on our u.s. patented methods that ut ilize the principle of ?prediction? logic circuit. the ic deliberates previous 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. it also maintains the mosfet?s body diode conduction at minimum level. the SP6012 is capable to adapt in almost all existing forward converters 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-10p) part marking (sop-10p) ? offers 4 to 8% efficiency improvement over schottky diodes (depend on drive configuration of the sr). ? drives all level power mosfet. ? prediction gate timing control. ? minimum mosfet body diode conduction. ? operating frequency up to 650 khz. ? synchronize to transformer secondary voltage waveform.
2010/01/ 05 ver.2 page 2 SP6012 synchronous rectifier driver typical applcation circuit pin description pin symbol description 1 timing discontinuous current filter timi ng adjustment resistor connection. 2 on delay imposed delay between catch ga te turn off and forward gate turn on. 3 prec adj capacitor to store previous cycle timing for catch mosfet 4 pref adj capacitor to store previous cycle timing for forward mosfet 5 mosg-f forward mosfet gate drive. 6 vr voltage regulator 7 gnd ground connection. 8 mosg-c catch mosfet gate drive. 9 vdd dc supply voltage. 10 sync synchronized signal from transformer?s output.
2010/01/ 05 ver.2 page 3 SP6012 synchronous rectifier driver block diagram ordering information part number package part marking SP6012s10rg sop-10p SP6012 i SP6012s10rgb sop-10p SP6012 i SP6012s10rg : 7 tape reel ; pb ? free SP6012s10rgb : 7 tape reel ; pb ? free ; halogen - free
2010/01/ 05 ver.2 page 4 SP6012 synchronous rectifier driver absoulte maximum ratings (t a =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 17 v sync sync voltage 7 v i out peak source current (pulsed) 3 a peak sink current (pulsed) 3 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 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 10 ma i dd supply current v sync =0v, no load 10 15 ma vonth vdd turn on threshold 9.5 10 v voffth vdd turn off threshold 8 8.5 v sync reference (sync) vshth sync high threshold 3.9 5.0 v vslth sync low threshold 0.9 1.2 v mosfet gate driver (mosg-c) voh output high voltage io = -200ma 11.5 11.8 v vol output low voltage io = 200ma 0.1 0.2 v td propagation delay no load 50 ns tpred no load 120 ns tr rise time load = 1nf (*) 50 100 ns tf fall time load = 1nf (*) 35 60 ns (*) tr & tf are measured among 10% an d 90% of starting and final voltage.
2010/01/ 05 ver.2 page 5 SP6012 synchronous rectifier driver performance characteristics (t a =25 , unless otherwise specified.) *fig. 1 : no load ; no sync *fig. 4~5 : frequency = 65 khz. sop- 10p package outline
2010/01/ 05 ver.2 page 6 SP6012 synchronous rectifier driver
2010/01/ 05 ver.2 page 7 SP6012 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 that may result from its 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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