MOSFET in parallel representing a very high current switch MOSFETs in fig. 1 are sharing the overall current I and it is exactly this current sharing which plays the most important role. For the paralleling of power MOSFETs, two parameter variations are of major importance. Cadence® PSpice technology offers more than 33,000 models covering various types of devices that are included in the PSpice Lite software. Download PSpice Lite for free and get all the Cadence PSpice models. 11A, 100V, P-Channel Power MOSFET - Enhancement Type. 2N6806: 6.5A, 200V, P-Channel Power MOSFET - Enhancement Type. 2N6845: Single.
Here is the 200W MOSFET amplifier powered based on four piece of IRFP250N, they are very cheap and easy to find in the electronic market in your area. The circuit has been assembled and tested with very good performance.This 200W MOSFET amplifier circuit designed for single or mono audio channel application. You should build two similar circuits for stereo audio application. Build one first for performance testing to ensure that this circuit really wongking well with great audio performance.The power supply used for this circuit is a symmetrical / dual polarity type. You need 4 amperes minimum of transformer with +/- 45V output. For stereo application, use about 8 amperes, although the 5A transformer is good enough 😀. You may use the power supply circuit design on this post: 200W MOSFET Amplifier PCB Layout DesignBottom / Chopper PCB DesignTop PCB Design / Component Placement.