IRFP Transistor Datasheet, IRFP Equivalent, PDF Data Sheets. MOSFET. Parameters and Characteristics. Electronic Component Catalog. IRFP TO IRFP NOTE: When ordering, use the entire part number . G. D. S. SOURCE. DRAIN. GATE. DRAIN. (TAB). Data Sheet. July irfp MOSFET are available at Mouser Electronics. Mouser offers inventory, pricing, & datasheets for irfp MOSFET.

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This much is true, but this alleged ‘benefit’ is actually completely useless in a linear circuit. It will be great if I get your valuable suggetions.

The value for R7 will depend on the linearity of the driver transistors. Compromise will be almost essential IMO. Better performance can be seen by using multiple LTPs, but this will not be a simple design in fact it will be quite complex with high frequency stability issues needing attention.

IRFP9240, SiHFP9240 product information

Hi Niklas in the place of R8 put a link. Well, that is the easy route to take for designing an output stage.

At one watt, the distortion is not measurable at all, unlike with datasheft class A driver. The values of these components will be found by experiment.

Finally, I’d like to thank Mitch for his contribution, since it describes the issues and how to solve them in an easy to follow manner, keeping complexity to the absolute minimum in the final design example. Remember that in 4 ohms one pair can Play up to watts!!

This is entirely counter-intuitive, and is almost certainly the exact opposite of what you would expect. Does bass preamp will work like a filter?

W MOSFET power amplifier circuit using IRFP, IRFP

There is not only one capacitance to deal with, but two one from the gate to source and the other from the gate to drain. This amplifier will burn.


This is because they suffer from second-breakdown – an instantaneous and catastrophic failure mode. Barely any third harmonic is seen.

While this is true to an extent, it is obvious that it is not a general rule upon which one should rely in all circumstances. I think that it will do the job, but I want to be sure.

There’s little or nothing in the datasheets to warn you, and many data sheets even show the SOA for DC. I suggest that high voltage, relatively low current devices are preferable to the reverse, as they will have an inherently higher R DS onand therefore a lower inflection point. We will do calculations using the gate charge method, which IR recommends AN Im also planing to do a LED spectrum analyser and digital volume controls with remote.

Make big traces on the PCB with decent sized spacing between other traces. Lateral MOSFETs as used in P have exactly the same issue, but the curve changes from negative to positive at a much lower current around mAand this is visible on the transfer characteristic graph but you will need to look for it carefully – it is not specified in a useful manner IMO. Tracks connected to Q7 Q8 source and drain and loud speaker. This eases the design of the bias servo.

The amplifier can be also used as a sub woofer amplifier but a subwoofer filter stage has to be added before the input stage.

We want to measure what the load is doing, not what it should be doing. The resistors seems to be fine. It’s worth noting that the TO package is useless regardless of what’s inside for getting rid of any more than about 20W worth of heat, unless extraordinary care is taken with mounting.

F1 and F2 are safety fuses. Filter capacitors C8 and C9 must be at least uF, higher the value lesser the ripple. This may include adding a class AB driver stage.

This greatly improved the amplifier. Make sure your measuring equipment is decently calibrated! That is why we need to buy a few extra and match them together.


As I powered up, Q5, Q6, and Q7 blew up. What power will get when i connect 10inch 4ohm subwoofr? Based on the above, it is quite apparent that vertical MOSFETs can easily get into thermal runaway dxtasheet the bias servo is not set up correctly. In an application note [ 1 ]OnSemi describe this transition as the ‘inflection’ point, and it is determined by V GSalthough it appears to be related more to the drain current than gate voltage.

IRFP9240 MOSFET. Datasheet pdf. Equivalent

However, most of the early types are obsolete, and their nominal replacements are ‘better’ in that R DS on is lower than the previous version s. Am I missing something or should the measurement be across just 1 x 0. Alright, now for some explanations. When we build linear power amplifiers, we always need to choose some device for the output stage. Yes, they most certainly will work, but you must be aware of the limitations.

If I power up six of these with the same power supply, what value should each rectifier diode have? These devices are now obsolete, but they were classified for V GS offwith ‘0’ classed devices having a threshold voltage of 0.

Make sure you check the idle current before calling the design done! Hi you are correct it should be 33mV. Likewise, the peak current should also be much lower than the rated maximum. They still need thermal compensation and a suitable gate drive design, and can suffer from a ‘latch-up’ condition in some cases. Also note that this amp was built on a breadboard.

I will use hz lowpass filter before the subwoofer amplifier, do it act as a preamp?