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SC4812 数据表(PDF) 1 Page - Semtech Corporation |
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SC4812 数据表(HTML) 1 Page - Semtech Corporation |
1 / 15 page 1 www.semtech.com SC4812 Current Mode PWM Controller with Integrated Start-up Circuit and Op Amp POWER MANAGEMENT Revision: February 6, 2007 Description Features Applications Typical Application Circuit Wide input range 12V to 90V High-voltage start-up circuit Current mode control Transconductance error amplifier Leading-edge blanking Cycle by cycle current limit Programmable external soft-start Thermal shutdown SO-8 package. Fully WEEE and RoHS compliant The SC4812 is a highly integrated current mode PWM controller designed for isolated or non-isolated dc-dc con- verters in telecommunication and data communication applications. It minimizes the amount of external discrete components needed and leads to substantial cost and space saving converter designs. The circuitry of the SC4812 includes an integrated high voltage start-up circuit suitable for telecom/industrial voltage applications. It is disabled during regular opera- tion and improves efficiency. Current mode control with leading-edge blanking simplifies control loop design and internal ramp compensation circuit stabilizes the current loop when operating above 50% duty cycle. Internal er- ror amplifier could be used for non-isolated applications. IP phones, PoE Telecom isolated converters Off-line isolated power supplies Instrumentation power supplies Battery chargers C6 C4 R1 R4 C3 C2 C5 R3 Q1 C1 R5 SS/SHDN 4 FB 2 COMP 3 CS 5 GND 6 OUT 7 U1 SC4812 D1 R2 Vin T1 Vout |
类似零件编号 - SC4812 |
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类似说明 - SC4812 |
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