2.7 KiB
2.7 KiB
tags, created
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2025-04-24 12:26 |
Summary
Notes about the EPLZON DC 5V-36V 15A 400W MOSFET Transistor Trigger Switch Drive Module available on Amazon.
Notes
The article [Dual MOSFET Switch Module – WORTH IT OR NOT? - Codrey Electronics][1] describes the board and it's strengths and shortcomings.
The circuit diagram is shown here:
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The board has two [AOD4184A MOSFET's][2] in parallel.
Key points to note:
- The switch is triggered from the J1 pin and grounded on the J4 pin
- Power flows through VIN+ to VOUT+ then is actually switched between VOUT- and VIN-
- Adding the [flyback diode][3] is important for solenoids to prolong the life of the switch
- It would be a good board to re-design our own version of to include the 2 resistors and the flyback diode that he mentions in the article
If you use a standard MOSFET, a 3.3V gate signal won't open the "channel" completely. This causes the MOSFET to have a high R_DS(on), meaning it will heat up rapidly, limit the amount of current your load can draw, and potentially burn out.
References
- Dual MOSFET Switch Module – WORTH IT OR NOT? - Codrey Electronics
- Driving Parallel MOSFETS
- Flyback diode - Wikipedia
- MOSFET selection for 3.3VDC
- AOD4184A datasheet
- SIHLR024 datasheet
- SiHLU024 DigiKey
- FDN337N datasheet
- AO3400 datasheet
- AO3400-202604 datasheet <- current favorite
- IRLZ44NPbF datasheet Through hole for better heat dissipation
- IRLML2502PbF
- MOSFET gate resistor
- YouTube - AO3040 board build
We could increase the 3.3V input signal to 5V using an NPM transistor, as in this circuit:
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