PCB for 5730 SMD LED TTP223 Capacitive Touch Board

Description

PCB for 5730 SMD LED TTP223 Capacitive Touch Board

An Empty PCB for A tiny, palm-sized lighting module you can drop into wearable, ambient, DIY, or product prototypes. The capacitive TTP223 touch switch lets you toggle the light with a fingertip, while a D882 NPN power transistor drives four 5730 high-brightness LEDs—each with its own 33 Ω (1206) resistor for balanced current.

Key Features

• Compact round PCB: 30 mm diameter (15 mm radius) for tight spaces.

• Capacitive touch control: TTP223 IC for no-mechanical, solid-state on/off.

• Robust LED drive: D882 power transistor handles the LED load reliably.

• 4× 5730 LED footprint: High-efficiency package; each LED has a 33 Ω 1206 series resistor.

• Clean two-wire hookup: Just V+ and GND to power; no external switch required.

• Low EMI, long life: No relays or clicky buttons; solid-state switching.

• Versatile uses: Accent light, indicator, night light, small lamp, art projects, toys, props, wearables.

Electrical Specs (Typical)

• Input voltage (recommended): 5 V DC

• LED configuration: 4 independent 5730 LEDs, each with 33 Ω series resistor
  • At 5 V with white LEDs (Vf ≈ 2.8–3.2 V): ~50–70 mA per LED (typ.), ~200–280 mA total

• Control: Touch to toggle (TTP223 OUT drives D882 base)

• Quiescent current (OFF): Typically <1 mA

• Polarity: V+ and GND silkscreened (reverse connection is not protected unless you add external diode)

🔎 Why 5 V? With 33 Ω resistors, 5 V yields a sensible LED current. Do not power from 12 V in this configuration—current will be excessive and can damage the LEDs.

Mechanical

• PCB: Round, Ø 30 mm

• Touch area: Exposed pad (or under-board touch through thin plastic/acrylic)

• LED size: 5730 (SMD)

• Resistor size: 1206 for each LED

Typical Performance @ 5 V (White LEDs)

• Per-LED current: ~60 mA (5 V – ~3.0 V) / 33 Ω

• Total current (4 LEDs): ~240 mA

• Power (LEDs only): ~1.2 W (varies by LED color/brand)

• Thermals: Module will get warm—ensure airflow or mount to a small heatsink/metal surface if used continuously at full brightness.

Pinout / Connections

• V+: +5 V DC input

• GND: Ground
  (No external switch needed; touch pad is on the PCB.)

SMD Soldering and Assembly Usage Guide

1. Supply 5 V to V+ and GND. A USB 5 V source or regulated 5 V supply works well.

2. Touch the pad to toggle the LEDs ON/OFF.

3. For behind-panel touch, place thin plastic/acrylic (≤2 mm) over the pad; TTP223 can usually sense through it.

4. If mounting in an enclosure, allow heat dissipation (vents or metal backing) for continuous use.

Notes & Options

• LED color: Works with standard 5730 packages (white by default; other colors possible).

• Brightness tuning: You can change the four 33 Ω resistors to adjust current (and brightness).

• External control: If you ever want MCU control, you can drive the D882 base (via a resistor) instead of the TTP223 output—just ask and I’ll provide a reference mod.