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SC4901ITSTRT Datasheet(PDF) 1 Page - Semtech Corporation |
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SC4901ITSTRT Datasheet(HTML) 1 Page - Semtech Corporation |
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1 / 20 page  1 www.semtech.com SC4901 COMBI-SYNC Secondary Side Synchronous Rectifier and Regulator POWER MANAGEMENT United States Patent 6,788,554 Revision: May, 2005 Description Features Applications Typical Application Circuit Single controller performs synchronous rectification and post regulation Independent regulation of multiple outputs from a common secondary winding Turn on shoot through inherently eliminated Primary switch turns ON and OFF with zero current No synchronising or any other signals needed across the isolation boundary Eliminates the need for a secondary bias supply Independent soft start, ON/OFF, remote sense and current limit for each output Resistive or inductive current sensing with 2V current signal and 2.5V reference for external applications. 4.5 to 18V operation Max operating frequency to 1 MHz Low profile 16 pin TSSOP package Based on Semtech’s patented Combi Sync concept SC4901 is a unique secondary side regulator designed for implementing Semtech’s proprietary Combi-Sync topology for isolated convertors with multiple outputs. The Combi-Sync is a true all-MOSFET topology that allows synchronous rectification and post regulation of transformer isolated outputs, resulting in higher efficiency and low component count. Details of this unique topology are described in the Application Information section. Multiple outputs can be synchronously rectified and independently regulated by individual SC4901s. Each output has its own ON/OFF control, soft start, remote sense and current limits. They can be turned on or off without affecting the primary or other outputs. The secondary side control makes it much easier to design tight control loops and implement load current sharing and hot swap features. All devices are synchronised to the transformer winding. The current sense can be either from the output inductor for high efficiency or a resistor for better accuracy. An amplified current signal is provided for external use. Each device is capable of driving high side MOSFETs with 2A current. The forward drive is configured for direct connection to a 1:1 pulse transformer. SC4901 has an undervoltage lockout with typical turn-on threshold of 4.5V and is available in a low cost TSSOP-16 package Telecom isolated DC to DC converters with multiple low voltage outputs High density brick and sub brick modules with independently regulated multiple outputs Distributed power architectures Isolated VRMs QS QF QR D4 •• T1 L1 C1 C9 C10 C2 C4 RZ R13 RT R5 R4 R8 R9 R1 R6 R7 R11 R14 R12 C7 C5 T2 D1 U 1 S C 4901 SINGLE ENDED FORWARD CONVERTOR CAO VO U T C8 R10 RTN D2 D3 C6 R15 CT C3 R3 R2 |
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