https://nalar.dev/tags/led-driver/ Recent content in LED Driver on Nalar Hugo en-us Sat, 19 Sep 2026 00:00:00 +0000 https://nalar.dev/power-architecture-inside-a-wifi-smart-led-bulb/ Sat, 19 Sep 2026 00:00:00 +0000 https://nalar.dev/power-architecture-inside-a-wifi-smart-led-bulb/ <p>A mains-powered smart LED bulb has two electrical jobs that should not be collapsed into one. Its LED array needs controlled current at a voltage determined by the LED string, while its Wi-Fi or Bluetooth controller needs a stable low-voltage supply.</p> <p>A simplified architecture is:</p> <div x-data="{ code: $el.querySelector('code').innerText, copied: false }" class="code-block group relative my-6 overflow-hidden rounded-xl border border-line bg-surface-muted dark:border-night-line dark:bg-night-surface"> <button type="button" @click="navigator.clipboard.writeText(code); copied = true; setTimeout(() => copied = false, 1600)" class="absolute right-3 top-3 z-10 rounded-lg border border-line-strong bg-surface px-2 py-1 font-mono text-[0.8rem] text-muted opacity-0 transition group-hover:opacity-100 hover:bg-ink hover:text-white dark:border-night-line dark:bg-night dark:text-night-muted dark:hover:bg-white dark:hover:text-ink"> <span x-text="copied ? 'Copied' : 'Copy'"></span> </button> <div class="overflow-x-auto p-4 text-sm leading-6 [&_pre]:!m-0 [&_pre]:!bg-transparent [&_pre]:!p-0 [&_code]:font-mono"> <div class="highlight"><pre tabindex="0" style="background-color:#fff;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-text" data-lang="text"><span style="display:flex;"><span>220-240 V AC </span></span><span style="display:flex;"><span> | </span></span><span style="display:flex;"><span>input protection and rectification </span></span><span style="display:flex;"><span> | </span></span><span style="display:flex;"><span> +--&gt; LED power stage --&gt; R / G / B / WW / CW channels </span></span><span style="display:flex;"><span> | </span></span><span style="display:flex;"><span> +--&gt; low-voltage supply --&gt; MCU + Wi-Fi/Bluetooth + control logic</span></span></code></pre></div> </div> </div> <p>The exact topology varies between products. The important boundary is the separation between LED power and logic power.</p>