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SC4809AIMSTR Datasheet(PDF) 1 Page - Semtech Corporation |
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SC4809AIMSTR Datasheet(HTML) 1 Page - Semtech Corporation |
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1 / 16 page  1 www.semtech.com SC4809A/B/C High Performance Current Mode PWM Controller POWER MANAGEMENT Revision: September 21, 2005 Description Features Applications Typical Application Circuit Operation to 1MHz Accurate programmable maximum duty cycle Line voltage monitoring External frequency synchronization Bi-phase mode of operation for low ripple Under 100µA start-up current Accessible reference voltage VDD undervoltage lockout -40°C to 105°C operating temperature 10 lead MSOP package. Lead free package available. Fully WEEE and RoHS compliant The SC4809A/B/C is a 10 pin BICMOS primary side current mode controller for use in Isolated DC-DC and off-line switching power supplies. It is a highly integrated solution, requiring few external components. It features a high frequency of operation, accurately programmable maximum duty cycle, current mode control, line voltage monitoring, supply UVLO, low start-up current, and programmable soft start with user accessible reference. It operates in a fixed frequency, highly desirable for Telecom applications. Features a separate sync pin which simplifies synchronization to an external clock. Feeding the oscillator of one device to the sync of another forces biphase operation which reduces input ripple and filter size. The SC4809A/B/C have different threshold and VREF to accommodate a wide variety of applications. These devices are available in the MSOP–10 lead free package. Telecom equipment and power supplies Networking power supplies Power over LAN applications Industrial power supplies Isolated power supplies C1 C5 C4 +48V -- 48V R6 C2 R7 R2 U4 SC4431 VCC 3 OUT 4 IN 1 EN 5 GND 2 U2 SC1301 Q2 R11 R10 T1 C6 U3 R9 R3 R1 R12 D1 C7 D2 C8 C9 R14 R13 Vout DISABLE VDD 1 LUVLO 2 SYNC 3 RCT 4 FB 7 GND 8 OUT 9 VREF 10 DMAX 5 SS 6 U1 SC4809 SYNC Q1 R4 R5 R8 C3 |
Similar Part No. - SC4809AIMSTR |
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