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SC4810EITSTRT Datasheet(PDF) 1 Page - Semtech Corporation |
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SC4810EITSTRT Datasheet(HTML) 1 Page - Semtech Corporation |
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1 / 24 page  1 www.semtech.com SC4810A/B/C/D/E High Performance Current Mode PWM Controller with Complementary Output, Programmable Delay POWER MANAGEMENT Revision: May 5, 2004 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 Independent programmable delays Hiccup mode current limit Under 250µA start-up current Programmable maximum volt-second clamp Accessible reference voltage VDD undervoltage lockout -40°C to 105°C operating temperature 16 lead TSSOP or MLPQ package The SC4810A/B/C/D/E is a 16 pin BICMOS primary side PWM 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. The output for switch is complementary to each other with programmable delay between each transition. The active technique allows single ended converters beyond 50% duty cycle and greater flux swing for the power transformer while reducing voltage stresses on the switches. The separate sync pin 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 SC4810A/D has a turn-on threshold of 4.5V, the SC4810B/E has a turn-on voltage threshold of 7V, and the SC4810C has a turn-on threshold of less than 12 volts. In the SC4810A/B/C, OUT2 is inverted to drive the N-MOSFET. In the SC4810D/E, OUT2 is non-inverted to drive the P-MOSFET. These devices are available in a TSSOP-16 or MLPQ-16 lead package. Telecom equipment and power supplies Networking power supplies Power over LAN applications Industrial power supplies Isolated power supplies VoIP phones Vout R19 C3 C4 C5 +48V R5 R2 U3 1 2 6 5 U4 SC431L C10 D3 R17 L1 C13 D2 C16 R1 U1 SC1302A 2 7 4 5 C15 R10 R21 R18 R3 U2 SC4810 RCT 4 FB 11 SY NC 3 CS 10 OUT1 15 DMAX 5 SS 9 DELAY 1 7 RAMP 6 VREF 16 OUT2 13 DELAY 2 8 R20 Q4 T1 C12 R15 R16 C9 R12 R13 R6 C8 D4 D1 R8 C1 C11 R11 R23 R9 C14 C2 R14 R22 Q1 D5 T2 R4 C6 C7 R7 Q3 Q2 |
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