Products
Power Management
Semtech SC4910A
High-Performance Secondary Side Controller with Synchronous Rectifier
The SC4910A/B is an integrated, full featured, secondary side controller designed for use in single ended and isolated switch mode power supplies with synchronous rectification where efficiency and fast transient response are of primary concern. The SC4910A/B has outputs for both primary FET and secondary synchronous rectification. The primary drive output is designed to drive a small and low cost pulse transformer to isolate the primary FET driver. The secondary control makes it much easier to monitor and control the system load with tight control loops and implement load current sharing and synchronous rectification.
Overview
Features
- Synchronous rectification with adaptive control
- Programmable secondary side delay
- Programmable switching frequency
- Programmable max. duty cycle
- Remote voltage sense capability
- Close-loop soft start with active-low shutdown
- 0.75 V precision reference for low-output applications
- Oscillator sychronization
- Under-voltage lockout
- Operation to 1 MHz
- Current-mode or voltage-mode operation
- Single-stage power conversion with multiphase link capability (with SC4201)
- Monotonic start-up with pre-biased output
- Active current-sharing capability
- 9 V typical start-up threshold
- 20-pin TSSOP package
Applications
- Telecom isolated DC to DC converters
- Isolated VRMS
- Networking power supplies
- Industrial power supplies
- Distributed power architectures
- High-density power modules
Packaging
TSSOP-20
Order Codes
- SC4910AITSTRT: Lead-Free, RoHS and WEEE Compliant, Package Minimum Tape & Reel Only
Diagrams and Specs
Block Diagram
Click diagram to enlarge