International Rectifier SupIRBuck IRDC3863, Руководство пользователя

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IRDC3863
9
Fig. 9: Startup
Fig. 10: Shutdown
TYPICAL OPERATING WAVEFORMS
Tested with demoboard shown in Fig. 8, 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
Fig. 11: DCM (I
OUT
= 0.1A)
Fig. 12: CCM (I
OUT
= 5A)
VOUT
PHASE
i
L
VOUT
PHASE
i
L
20mV/div 10V/div 500mA/div 5µs/div 20mV/div 10V/div 2A/div 2µs/div
PGOOD
VOUT
PGOOD
FB
VOUT
i
L
5V/div 1V/div 500mV/div 2A/div 50µs/div 5V/div 1V/div 1V/div 5A/div 500µs/div
SS
Fig. 13: Over Current Protection (tested by
shorting VOUT to PGND)
Fig. 14: Over Voltage Protection
(tested by shorting FB to VOUT)
I
OUT