6A ? Highly ? Integrated ? SupIRBuck TM ?
IR3473 ?
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. ?
VOUT
VOUT
PHASE
PHASE
iL
iL
50mV/div 10V/div 2A/div
100μs/div
?
50mV/div 10V/div 5A/div
100μs/div
?
Figure ? 17: ? Load ? Transient ? 0 ‐ 3A ?
Figure ? 18: ? Load ? Transient ? 3 ‐ 6A ?
FCCM
FCCM
PHASE
PHASE
VOUT
VOUT
iL
iL
?
?
5V/div 10V/div 500mV/div 5A/div
10μs/div
2V/div 10V/div 500mV/div 5A/div
5μs/div
(IR3473: ? 64 C, ? Inductor: ? 48 C, ? PCB: ? 37 C)
(IR3473: ? 67 C, ? Inductor: ? 49 C, ? PCB: ? 38 C) ?
Figure ? 19: ? DCM/FCCM ? Transition ?
Figure ? 21: ? Thermal ? Image ? at ? VIN ? = ? 12V, ? I OUT ? = ? 6A ??
o o o
?
Figure ? 20: ? FCCM/DCM ? Transition ?
Figure ? 22: ? Thermal ? Image ? at ? VIN ? = ? 19V, ? I OUT ? = ? 6A ??
o o o
?
11
March ? 27, ? 2013 ?? | ?? V2.2 ? | ?? PD97601
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