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The picture, when EN pin command boost converter failure after, the Lord switch, nDIMFET pin and FLT pin will be closed, from the current will flow into the Vin approach and zero, effectively avoid any leakage current flow into the series of LED together, because right now the boost converter have failed. Leakage current due to no longer there, when stop the battery can be packed, so can effectively extend battery life. LM3423 consists of the booster LED drive circuit:
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