Semtech SC4809A
The SC4809A/B/C is a 10 pin BICMOS primary side current mode 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. Features a separate sync pin which 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.
Overview
Features
- Operation to 1 MHz
- Accurate programmable maximum duty cycle
- Line voltage monitoring
- External frequency synchronization
- Bi-phase mode of operation for low ripple
- Under 100 µA start-up current
- Accessible reference voltage
- VDD under-voltage lockout
- -40°C to 105°C operating temperature
- 10-lead MSOP package
Applications
- Telecom equipment and power supplies
- Networking power supplies
- Power over LAN applications
- Industrial power supplies
- Isolated power supplies
Packaging
MSOP-10
Order Codes
- SC4809AIMSTR: Package Minimum Tape & Reel Only
- SC4809AIMSTRT: Lead-Free, RoHS and WEEE Compliant, Package Minimum Tape & Reel Only
Diagrams and Specs
Block Diagram
Click diagram to enlarge