IR3863MPBF
TYPICAL OPERATING DATA
Tested with demoboard shown in Figure 7, 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
1ms/div
VOUT
Figure 8: Startup
Figure 9: Shutdown
VOUT
PHASE
PHASE
i L
i L
20mV/div 10V/div 500mA/div
5μs/div
20mV/div 10V/div 2A/div
2μs/div
PGOOD
VOUT
Figure 10: DCM (I OUT = 0.1A)
Figure 11: CCM (I OUT = 5A)
PGOOD
FB
SS
VOUT
IOUT
i L
5V/div 1V/div 1V/div 5A/div
500us/div
5V/div 1V/div 500mV/div 2A/div
50μs/div
Figure 12: Over Current Protection
(tested by shorting VOUT to PGND)
8/8/2012 Rev3.2
Figure 13: Over Voltage Protection
(tested by shorting FB to VOUT)
9
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