TL431 regulate 4.75-5.5V USB supply through LED down to 2.50674V within 1 mV

circuit-20250130-0155.svg

<svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="668" height="260"><defs><clipPath id="xTHMVRoBNumZ"><path fill="none" stroke="none" d=" M 0 0 L 192 0 L 192 144 L 0 144 L 0 0 Z"/></clipPath><linearGradient id="MbaXxadeTTMU" x1="0px" x2="16px" y1="0px" y2="0px" gradientUnits="userSpaceOnUse"><stop offset="0" stop-color="#14ea14"/><stop offset="1" stop-color="#01fd01"/></linearGradient></defs><g><rect fill="#000000" stroke="none" x="0" y="0" width="668" height="260"/><g transform="scale(1,1) translate(-538,-430)"><g><path fill="none" stroke="#807f7f" paint-order="fill stroke markers" d=" M 784 624 L 784 608" stroke-linecap="round" stroke-miterlimit="10" stroke-width="3" stroke-dasharray=""/><text fill="#ffffff" stroke="none" font-family="normal" font-size="20px" font-style="normal" font-weight="normal" text-decoration="normal" x="778" y="598" text-anchor="start" dominant-baseline="alphabetic">A</text><path fill="none" 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stroke="#40be40" paint-order="fill stroke markers" d=" M 736 560 L 752 560" stroke-linecap="round" stroke-miterlimit="10" stroke-width="3" stroke-dasharray=""/><text fill="#ffffff" stroke="none" font-family="sans-serif" font-size="12px" font-style="normal" font-weight="normal" text-decoration="normal" x="744" y="554" text-anchor="start" dominant-baseline="alphabetic"></text><path fill="none" stroke="#40be40" paint-order="fill stroke markers" d=" M 736 480 L 784 480" stroke-linecap="round" stroke-miterlimit="10" stroke-width="3" stroke-dasharray=""/><text fill="#ffffff" stroke="none" font-family="sans-serif" font-size="12px" font-style="normal" font-weight="normal" text-decoration="normal" x="760" y="474" text-anchor="start" dominant-baseline="alphabetic"></text><g><g><text fill="#ffffff" stroke="none" font-family="sans-serif" font-size="14px" font-style="normal" font-weight="normal" text-decoration="normal" x="880" y="480" text-anchor="middle" dominant-baseline="central">2506.740 mV</text></g><path fill="none" stroke="#40be40" paint-order="fill stroke markers" d=" M 832 480 L 829 480" stroke-linecap="round" stroke-miterlimit="10" stroke-width="3" stroke-dasharray=""/></g><path fill="none" stroke="#807f7f" paint-order="fill stroke markers" d=" M 656 608 L 656 548" stroke-linecap="round" stroke-miterlimit="10" stroke-width="3" stroke-dasharray=""/><path fill="none" stroke="#01fd01" paint-order="fill stroke markers" d=" M 656 540 L 656 480" stroke-linecap="round" stroke-miterlimit="10" stroke-width="3" stroke-dasharray=""/><path fill="none" stroke="#807f7f" paint-order="fill stroke markers" d=" M 646 548 L 666 548" stroke-linecap="round" stroke-miterlimit="10" stroke-width="3" stroke-dasharray=""/><path fill="none" stroke="#01fd01" paint-order="fill stroke markers" d=" M 640 540 L 672 540" stroke-linecap="round" stroke-miterlimit="10" stroke-width="3" stroke-dasharray=""/><g><g><text fill="#ffffff" stroke="none" font-family="sans-serif" font-size="14px" font-style="normal" font-weight="normal" text-decoration="normal" x="608" y="480" text-anchor="middle" dominant-baseline="central">5000.000 mV</text></g><path fill="none" stroke="#01fd01" paint-order="fill stroke markers" d=" M 656 480 L 659 480" stroke-linecap="round" stroke-miterlimit="10" stroke-width="3" stroke-dasharray=""/></g><path fill="none" stroke="#807f7f" paint-order="fill stroke markers" d=" M 832 608 L 832 548" stroke-linecap="round" stroke-miterlimit="10" stroke-width="3" stroke-dasharray=""/><path fill="none" stroke="#807f7f" paint-order="fill stroke markers" d=" M 820 548 L 844 548" stroke-linecap="round" stroke-miterlimit="10" stroke-width="3" stroke-dasharray=""/><path fill="none" stroke="#40be40" paint-order="fill stroke markers" d=" M 832 480 L 832 540" stroke-linecap="round" stroke-miterlimit="10" stroke-width="3" stroke-dasharray=""/><path fill="none" stroke="#40be40" paint-order="fill stroke markers" d=" M 820 540 L 844 540" stroke-linecap="round" 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