ELECTRONICS
TTP223 Touch Switch with MOSFET for LED Strip
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CASE ANALYSIS
Scenario
A capacitive touch switch controls a low-side N-channel MOSFET to turn a 5V LED strip on and off. The TTP223 output drives the MOSFET gate, with a pull-down resistor keeping the gate low when idle.
Key decisions
- Use N-channel MOSFET low-side switching so the gate can be driven directly from the TTP223's 5V output
- Add 10k pull-down resistor on the gate to keep the LED strip off during power-up or no-touch
- Place 100nF decoupling capacitor across TTP223 VCC for stable touch detection
When to reuse this
Reuse for any capacitive touch toggle switch controlling low-power LED strips or small DC loads from a 5V sensor output.
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circuit-ttp223-touch-switch-with-mosfet-for-led-strip-dimming