MP3908 Datasheet | Monolithic Power Systems

DESCRIPTION The MP3908 is a flexible current-mode PWM controller optimized for power-supply applications. The MP3908 features resistorprogrammable dead-time control to optimize efficiency for a broad number of different configurations, and a synchronous secondary gate drive. The MOSFET drivers are capable of driving >10A MOSFETs. It has an operational current of typically 270µA and can acmodate off-line, Tele and non-isolated applications. Under-voltage lockout, soft-start, slope pensation and peak current limiting are all included. In a boost application, with an output voltage of less than 28V, the current sense pin can connect directly to the drain of the external switch. This eliminates the requirement for an additional current sensing element and its associated efficiency loss. While designed for boost applications, the MP3908 can also be used for other topologies including Forward, Flyback and Sepic. The 10V gate driver pliance minimizes the power loss of the external MOSFET while allowing the use of a wide variety of standard threshold devices. An externally programmable delay following the turn off of the synchronous rectifier allows the incorporation of secondary side synchronous rectifier The MP3908 is available in space saving 10-pin MSOP package. FEATURES - Programmable Dead-Time - Synchronous Secondary Gate Drive - Current Mode Control - 10V MOSFET Gate Drivers - Drives >10A MOSFETs - Soft-Start - Cycle-by-Cycle Current Limiting - Slope Current pensation - Lossless Current Sense (VISENSE<28V) - 50µA Shutdown Current - 270u A typical Operating Current - 250KHz Constant Frequency Operation - Applicable to Boost, SEPIC, Flyback and Forward Topologies - Available in a 10-Pin MSOP Package APPLICATIONS - Po E PD Power Supplies - TV CCFL Power Generation - Tele Isolated Power - Brick Modules - Off-line Controller “MPS” and “The Future of Analog IC Technology” are Registered Trademarks of Monolithic Power Systems, Inc. TYPICAL APPLICATION 5 DELAY 7...