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SC4910BITSTRT Datasheet(PDF) 1 Page - Semtech Corporation |
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SC4910BITSTRT Datasheet(HTML) 1 Page - Semtech Corporation |
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1 / 19 page  1 www.semtech.com SC4910A/B High Performance Secondary Side Controller with Synchronous Rectifier POWER MANAGEMENT Revision: June 1, 2005 Description Features Applications Typical Application Circuit Synchronous rectification with adaptive control Programmable secondary side delay Programmable switching frequency Programmable max. duty cycle Remote voltage sense capability Close-loop soft start with active low shutdown 0.75V precision reference for low output applications Oscillator sychronization Undervoltage Lockout Operation to 1MHz Current-mode or voltage-mode operation Single stage power conversion with multiphase link capability (with SC4201) Monotonic start-up with pre-biased output Active current sharing capability 20 pin TSSOP package The SC4910A/B is an integrated, full featured, second- ary side controller designed for use in single ended and isolated switch mode power supplies with synchronous rectification where efficiency and fast transient response are of primary concern. The SC4910A/B has outputs for both primary FET and secondary synchronous rectifica- tion. The primary drive output is designed to drive a small and low cost pulse transformer to isolate the primary FET driver. The secondary control makes it much easier to monitor and control the system load with tight control loops and implement load current sharing and synchro- nous rectification. The SC4910A/B features synchronous rectification, multi- phase link capability, programmable secondary side delay, programmable switching frequency and program- mable maximum duty cycle. It is designed for either current mode or voltage mode operation. The SC4910A has a typical turn-on threshold of 9V and the SC4910B has a threshold of 4.5V. +12V C4 LOAD C6 T3 R3 C5 C1 M1 SC1301 M2 R8 C10 R4 R7 T2 C2 R2 R6 L1 D2 SC4910 18 17 11 12 6 4 8 7 20 19 3 1 15 2 5 10 FB COMP OUTB ISHARE PHASE CS OUTA PGND RT1 RT2 SS -SENSE DELAY SYNC/EN VREF PVCC M3 SC1301 D3 C8 +Vin R1 C9 SC1301 R9 C3 D1 R5 T1 16 13 14 PVCC AVCC 9 PGND AGND Telecom isolated DC to DC converters Isolated VRMS Networking power supplies Industrial power supplies Distributed power architectures High density power modules |
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