| Component | Value/Part | Purpose | | :--- | :--- | :--- | | C1 | 100µF / 35V Electrolytic | Input bulk capacitance (handles inrush current) | | C2 | 0.1µF / 50V Ceramic X7R | High-frequency noise suppression | | D1 | SS34 or 1N5819 Schottky | Reverse polarity protection (optional but recommended) | | R_sense | Calculated (0.05Ω to 1Ω) | Sets LED current; use 2512 package for 1W+ dissipation | | IC | Highway 09 | Main regulator | | LED String | 3x 3W LEDs in series | Forward voltage ~9-11V |
The HIGHWAY09A is highly regarded for its stability in high-demand environments. Key electrical characteristics typically found in the datasheet include: highway 09 ic datasheet