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5.1.
5V   Power   Supply  
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5V ? power ? from ? an ? external ? wall ? power ? supply ? is ? connected ? to ? the ? Quick ? Start ? board ? at ? connector ? J1. ?
From ? the ? connector, ? the ? 5V ? supply ? is ? sent ? directly ? to ? a ? 3A ? over ? current ? protection ? fuse ? (F1). ? In ? between ?
the ? connector ? and ? the ? fuse, ? there ? are ? two ? capacitors ? to ? bleed ? off ? voltage ? transients ? and ? a ? single ? trace ?
that ? leads ? to ? the ? sense ? pin ? for ? the ? over ‐ voltage ? protection ? circuitry ? of ? the ? Dialog ? PMIC. ? From ? the ?
protection ? fuse, ? the ? 5V ? supply ? is ? connected ? to ? the ? over ‐ voltage ? protection ? POWERFET ? Q1 ? which ? is ?
controlled ? by ? the ? PMIC. ? This ? circuit ? limits ? to ? a ? very ? small ? area ? of ? the ? Quick ? Start ? board ? the ? physical ?
location ? of ? where ? unprotected ? 5V ? power ? can ? reach. ? The ? 5V_MAIN ? power ? seen ? by ? the ? rest ? of ? the ? Quick ?
Start ? board ? is ? protected ? from ? over ‐ voltage ? and ? over ‐ current. ? The ? circuit ? is ? shown ? below ? in ? Figure ? 15. ?
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Figure ? 15. ?
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Freescale Semiconductor
Board ? Main ? Power ? Circuit. ?
Hardware User Guide for i.MX53 Quick Start Board,
Preliminary Rev 0.91
30
PUBI – Public Use Business Information ?
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