SC4910B Datasheet | SEMTECH

Description The SC4910A/B is an integrated, full featured, secondary 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 rectification. 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 synchronous rectification. The SC4910A/B Features synchronous rectification, multiphase link capability, programmable secondary side delay, programmable switching frequency and programmable 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. SC4910A/B Features ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ 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 Applications ‹ ‹ ‹ ‹ ‹ ‹ Tele isolated DC to DC converters Isolated VRMS Networking power supplies Industrial power supplies Distributed power architectures High density power modules L1 R1 C2 LOAD Typical Application Circuit +Vin T1 R2 C1 C3 M1 D1 M2 SC1301 SC1301 +12V SC1301 M3 12 T2 D2 4 R3 R4 R5 10 20 19 3 15 5 PVCC CS OUTA RT1 RT2 SS DELAY VREF AGND C9 C8 T3 C10 7 R9 PGND 8 13 PVCC 14 AVCC 16...