12A ? Highly ? Integrated ? SupIRBuck TM ?
IR3476 ?
TYPICAL ? OPERATING ? DATA ??
Tested ? with ? demoboard ? shown ? in ? Figure ? 4, ? VIN ? = ? 12V, ? VCC ? = ? 5V, ? VOUT ? = ? 1.05V, ? Fs ? = ? 300kHz, ? T A ? = ? 25 o C, ? no ? airflow, ? unless ?
otherwise ? specified.
EN
PGOOD
SS
VOUT
EN
PGOOD
SS
VOUT
5V/div
5V/div 1V/div 500mV/div
5ms/div
?
5V/div 5V/div 1V/div 500mV/div
500μs/div
?
VOUT
PHASE
iL
Figure ? 11: ? Startup ?
Figure ? 12: ? Shutdown ?
VOUT
PHASE
iL
20mV/div 5V/div 5A/div
10μs/div
?
20mV/div 5V/div 10A/div
2μs/div
?
PGOOD
SS
VOUT
iL
Figure ? 13: ? DCM ? (I OUT ? = ? 0.1A) ?
?
Figure ? 14: ? CCM ? (I OUT ? = ? 12A) ?
?
PGOOD
FB
VOUT
iL
5V/div 1V/div 1V/div 10A/div
2ms/div
?
5V/div 1V/div
500mV/div 2A/div
50μs/div
?
Figure ? 15: ? Over ? Current ? Protection ??
(tested ? by ? shorting ? VOUT ? to ? PGND) ?
Figure ? 16: ? Over ? Voltage ? Protection ??
(tested ? by ? shorting ? FB ? to ? VOUT)
10
March ? 27, ? 2013 ?? | ?? V2.2 ?? | ?? PD97603
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