Description
- Base (B): You send a small current to the Base pin (usually through a resistor). This acts like “turning the tap on.”
- Collector (C): The 12V power supply is connected here.
- Emitter (E): This is connected to the Ground (Negative).
- The Result: When the Base receives a signal, the TCNL100 allows a much larger current to flow from the Collector to the Emitter, completing the circuit and spinning the fan.
Quick Technical Summary
- Purpose: To control a “High Load” (12V Fan) with a “Low Power” signal.
- Mode: Saturation Mode (acting as a fully closed switch).
- Advantage: The TCNL100 can handle the heat and current of the motor that a simple sensor or microchip would otherwise burn out from.
