Current Mode PWM Controller with Synchronous Gate Drive
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The MP3908 is a flexible current-mode PWM controller optimized for power-supply applications. The MP3908 features resistor-programmable 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 accommodate off-line, Telecom and non-isolated applications. Under-voltage lockout, soft start, slope compensation 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 compliance 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.
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- Programmable Dead-Time
- Synchronous Secondary Gate Drive
- Current Mode Control
- 10V MOSFET Gate Drivers
- Drives >10A MOSFETs
- Cycle-by-Cycle Current Limiting
- Slope Current Compensation
- Lossless Current Sense (VISENSE<28V)
- 50µA Shutdown Current
- 270uA typical Operating Current
- 250kHz Constant Frequency Operation
- Applicable to Boost, SEPIC, Flyback and Forward Topologies
- Available in a 10-Pin MSOP Package
EV3908DK-01A Evaluation Kit High Efficiency Isolated Flyback Converter EV Board
The EV3908DK-01A is an evaluation board for the MP3908DK. It is configured to provide a regulated 5V output at up to 5A load current from a 36V-72V input. The output is adjustable by changing feedback resistors on the evaluation board.
MP3908DK features a synchronous gate output which enables high efficiency design by relating the schottky rectifier by a MOSFET.