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12A ? Highly ? Integrated ? SupIRBuck TM ?
IR3476 ?
UNDER/OVER ? VOLTAGE ? MONITOR ?
The ? IR3476 ? monitors ? the ? voltage ? at ? the ? FB ? node ? through ? a ?
350ns ? filter. ? If ? the ? FB ? voltage ? is ? below ? the ? under ? voltage ?
threshold, ? UV# ? is ? set ? to ? LOW ? holding ? PGOOD ? to ? be ? LOW. ? If ?
the ? FB ? voltage ? is ? above ? the ? over ? voltage ? threshold, ? OV# ? is ?
set ? to ? LOW, ? the ? shutdown ? signal ? (SD) ? is ? set ? to ? HIGH, ?
MOSFET ? gates ? are ? turned ? off, ? and ? PGOOD ? signal ? is ? pulled ?
low. ? Toggling ? VCC ? or ? EN ? will ? allow ? the ? next ? start ? up. ? Figure ?
24 ? and ? 25 ? show ? PGOOD ? status ? change ? when ? UV/OV ? is ?
detected. ? The ? over ? voltage ? and ? under ? voltage ? thresholds ?
can ? be ? found ? in ? the ? Electrical ? Specification ? section. ??
?
MOSFET, ? VPHASE, ? is ? monitored ? for ? over ? current ? and ? zero ?
crossing. ? The ? OCP ? circuit ? evaluates ? VPHASE ? for ? an ? over ?
current ? condition ? typically ? 270ns ? after ? the ? lower ? MOSFET ?
is ? gated ? on. ? This ? delay ? functions ? to ? filter ? out ? switching ?
noise. ? The ? minimum ? lower ? gate ? interval ? allows ? time ? to ?
sample ? VPHASE. ?
The ? over ? current ? trip ? point ? is ? programmed ? with ? a ? resistor ?
from ? the ? ISET ? pin ? to ? PHASE ? pin, ? as ? shown ? in ? equation ? 4. ??
When ? over ? current ? is ? detected, ? the ? MOSFET ? gates ? are ? tri ‐
state ? and ? SS ? voltage ? is ? pulled ? to ? 0V. ?? This ? initiates ? a ? new ?
soft ? start ? cycle. ? If ? there ? is ? a ? total ? of ? four ? OC ? events, ? the ?
IR3476 ? will ? disable ? switching. ? Toggling ? VCC ? or ? EN ? will ? allow ?
the ? next ? start ? up. ?
?
?
?
?
R SET =
R DSON ? I OC
19 μ A
(4)
?
?
?
?
?
* ? typical ? filter ? delay ?
Figure ? 24: ? Under/Over ? Voltage ? Monitor ?
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Figure ? 26: ? Over ? Current ? Protection ?
?
?
?
* ? typical ? filter ? delay ?
Figure ? 25: ? Over ? Voltage ? Protection ?
?
OVER ? CURRENT ? MONITOR ?
The ? over ‐ current ? circuitry ? monitors ? the ? output ? current ?
during ? each ? switching ? cycle. ? The ? voltage ? across ? the ? lower ?
UNDER ? VOLTAGE ? LOCK ‐ OUT ?
The ? IR3476 ? has ? VCC ? and ? EN ? under ? voltage ? lock ‐ out ? (UVLO) ?
protection. ? When ? either ? VCC ? or ? EN ? is ? below ? their ? UVLO ?
threshold, ? IR3476 ? is ? disabled. ? IR3476 ? will ? restart ? when ?
both ? VCC ? and ? EN ? are ? above ? their ? UVLO ? thresholds. ?
OVER ? TEMPERATURE ? PROTECTION ??
When ? the ? IR3476 ? exceeds ? its ? over ? temperature ? threshold, ?
the ? MOSFET ? gates ? are ? tri ‐ state ? and ? PGOOD ? is ? pulled ? low. ?
Switching ? resumes ? once ? temperature ? drops ? below ? the ? over ?
temperature ? hysteresis ? level. ?
13
March ? 27, ? 2013 ?? | ?? V2.2 ?? | ?? PD97603
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