DESCRIPTION. Third generation Power MOSFETs from Vishay provide the designer with the best combination of fast switching, ruggedized. IRFPN Transistor Datasheet, IRFPN Equivalent, PDF Data Sheets. MOSFET. Parameters and Characteristics. Electronic Component Catalog. IRFPN datasheet, IRFPN circuit, IRFPN data sheet: IRF – Power MOSFET(Vdss=55V, Rds(on)=ohm, Id=53A),alldatasheet, datasheet.

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The user interface is built using the Kivy Pi Python toolkit. It’s small enough not to be a concert mVs The banana sockets have enough resistance that the measurement of the voltage at the back of the terminals creates a few mV of error at the front of the terminals. Bigger boards cost more and will take more debugging time.

There is a bi-colour LED that indicates the power state of the whole system and a momentary switch the user uses to turn on or off the entire system. At this point the capacitor current is greatly reduced as the capacitors have charged.

I reduced this a lot but I didn’t want to compromise the speed. The problem is I need a gate voltage well above the output to make this work. Rather than one big board it makes sense for each supply channel to be separate. Using a low-frequency low noise pre-regulator circuit that cuts charging to the bulk capacitors. In addition the circuit switches transformer taps for different voltage ranges.

I found an alternative circuit on the EEVBlog forum that was reproduced by a member called BlackDog from a design that came from elsewhere. Tom Biskupic 26 March at These proved to be pretty robust, had good thermal transfer and low enough gate charge to drive quickly for my purposes.

Hi first of all i must say that this is a real power supply and probably one of the most complete on the internet. See here for the first attempt. Then the entire control system would have been floating above the positive output rail and I could have used lower voltage cheaper parts.


This page provides an outline of the project and links to the various blog posts that I wrote as I was developing the power supply. Lab Power Supply Project. As a result the Raspberry Pi has its own switching supply that powers it and the touch screen. Digitally settable output voltage. If you decide to do something with my design consider buying me a beer!

55V Single N-Channel HEXFET Power MOSFET In A TO-247AC Package

Kivy Pi renders all of the buttons, text and other GUI widgets and handles touch events. This gave the additional voltage I needed without much hassle. There is a small overshoot when the voltage is set or when it comes out of current limit. Maybe a web interface or for it to be LXI compatible or both.

A 5 to 12V switching converter provides power for a small fan and the raspberry PI uses PWM to control the speed of datasheef fan in response to the temperature of the system. What I don’t like.

IRFPN Datasheet PDF – Power MOSFET

Managing the heat achieved by:. The LTC part has spectacularly low offset voltage and precision but is relatively slow. Three isolated output channels. The GUI is really slow.

The problem with this circuit is it generates considerable noise as it switches at the point where the current is maximal. I eventually figured out this was a thermo-electric affect.

Doesn’t have to be quick. Even show cumulative amount of energy consumed by the driven circuit. This means a decent graphical display is required To have an Ethernet interface. What could irfp0044n been done better:.

IRFPN (IRF) – Power Mosfet(vdss=55v, Rds(on)=ohm, Id=53a), N-Channel

Big high VA transformers are expensive and to accommodate multiple channels the transformer would have to have lots of taps. I was initially using Welwyn wire power resistors but had lots of problems with the readings wandering as the resistor heated up.


Large heat-sinks Temperature controlled fan Use of Datzsheet as the pass element and pre-regulator switching element to reduce the dropout voltage of the regulator. I may re-visit this. Python code polls the state of each channel and updates the GUI. It’s not the GUI itself but the fact that the system is polling three channels over relatively slow serial links.

I tried using 4 wire outputs but had stability issues.

More on the pre-regulator below. The specs I ended up with were: There is lots more that could be done here.

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The Raspberry Pi cannot be powered off but must be allowed to shutdown gracefully. Each channels communicates with the control interface via isolated USB each channel has an on-board datashet and isolated USB interface.

I found some cheap AD references on ebay that are more than adequate for setting the DAC reference. Also as this thing is a one-off I decided that using expensive components was a total non-issue. The project datsheet blog talks more about what I was originally thinking.

Initially I used a voltage doubler circuit but this messed with the voltage waveforms under low-power enough that my pre-regulator wouldn’t work.

Of course I could buy one but given I an am using this supply datashert learn about electronics it seemed a perfect opportunity to build one! So In general what I’d like is to have two or three output channels and the ability to run two in dual tracking mode.