For camper van LED lighting, compare a MOSFET switch module by its documented input, output channels, load rating and dimming compatibility.
A MOSFET is a type of field-effect transistor, or FET. The “FET 1” and “FET 4” wording in the original question refers to the board comparison below; it does not identify two separate transistor families.
The First Recovered Module Description
The original article describes a five-piece pack of dual-MOSFET trigger boards. “Five pieces” is the pack quantity.
Before using those figures, obtain the exact model documentation and check which voltage applies to the load supply, which applies to the control input, and under what conditions the current rating is supported.
The Second Recovered Module Description
The other board description uses “4 Channel” wording. Its schematic, terminal functions and control inputs identify the board’s switching arrangement.
Several MOSFETs can be connected in parallel to form one switching path. Infineon’s Paralleling Power MOSFETs explains why current sharing, losses and temperature require attention. Counting devices on a board is not a substitute for its circuit documentation.
Compare The Specifications That Matter
| Check | What To Verify |
|---|---|
| Independent Outputs | Number of separately controlled load paths, rather than the number of transistors or boards in a pack. |
| Load Supply | Supported operating voltage and the conditions covered by the manufacturer’s rating. |
| Control Input | Required signal level, input polarity and whether the board accepts the controller’s PWM signal. |
| Current And Cooling | Continuous versus peak current, per-channel versus total limits, and required thermal conditions. |
| Load Compatibility | Whether the light or its LED driver supports the proposed dimming method. |
Read Current And Wattage Together
For an illustrative DC load at 12V and 10A, load power is 120W: voltage multiplied by current.
The power delivered to a light is also different from the heat dissipated in its switch. Gate drive, on-resistance, switching losses and cooling affect the device. Board traces and terminals have limits too. Texas Instruments’ Using MOSFET Safe Operating Area Curves In Your Design explains how voltage, current, time and temperature interact.
When One Switching Path May Be Enough
If one lighting zone should turn on or dim together, one documented switching path may meet the control requirement. Two or more MOSFETs on that path do not create separate zones. Choose it only after confirming the light’s compatibility and the module’s input, current and thermal requirements.
A single switching path ties connected lights to the same command. The board documentation identifies its load capacity and electrical characteristics.
When Separate Lighting Zones Matter
Interior, side and rear lights may need different commands. That requires documented independently controlled channels or separate suitable modules. Confirm how any shared terminals and total-board limits affect the design before assuming every output can run at a headline current simultaneously.
For PWM dimming, check the LED driver as well as the switch. TI’s TPS61183 LED Driver is one example of a device with a specified PWM interface. Its documentation illustrates why dimming support belongs to a particular device and control interface, not to all products described as LED lights.
Check The Lighting System Before Buying
- Identify The Load: Record the exact lights, their supply requirements and supported dimming method.
- Define The Zones: List which lights need independent control and which can operate together.
- Identify The Board: Obtain its model, schematic, terminal functions and documented operating limits.
- Match The Controller: Confirm signal levels and PWM compatibility before connecting control electronics.
- Review The Installation: Record the wiring, overcurrent protection, mounting, enclosure and thermal requirements.
The recovered descriptions are insufficient to endorse either board’s continuous capacity or channel arrangement. Use a module with documentation that supports your actual load and control requirements. The Roof Wiring Build Entry preserves the original project context, and the Tools And Materials By Project links products to the build tasks.