Products
Power Management
Semtech SC4901
Combi-Sync™ Secondary-Side Synchronous Rectifier and Regulator
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.
Overview
Features
- 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 synchronizing 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 2 V current signal and 2.5 V reference for external applications
- 4.5 V to 18 V operation
- Max. operating frequency to 1 MHz
- Low-profile 16-pin TSSOP package
- Based on Semtech’s patent-pending Combi-Sync™ concept
Applications
- 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
Packaging
TSSOP-16
Order Codes
- SC4901ITSTRT: Lead-Free, RoHS and WEEE Compliant, Package Minimum Tape & Reel Only
Diagrams and Specs
Block Diagram
Click diagram to enlarge