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IR3710MTRPBF
TYPICAL OPERATING WAVEFORM
(Circuit of Figure 18, VCC = 3.3V, V5 = 5V, V IN = 12.6V, Unless otherwise noted.)
CH1:Vout(20mV/div), CH2: PHASE (5V/div)
CH1:Vout(0.5V/div), CH2: PHASE (20V/div)
CH3: PGOOD(5V/div), CH4:EN(5V/div) ; 50uS/div
CH4: CPO(2V/div) ; 5uS/div
Figure 10. Charge Pump ON
Figure 7. Start up with FCCM = Low @ 30mA
CH1:Vout(0.5V/div), CH2: PHASE (20V/div)
CH3: PGOOD(5V/div), CH4:EN(5V/div) ; 50uS/div
Figure 8. Start up with Prebias Vout, FCCM = Low @ 30mA
CH1:Vout(20mV/div), CH2: PHASE (5V/div)
CH1:Vout(20mV/div), CH2: PHASE (5V/div), CH4:
CPO(2V/div) ; 100uS/div
Figure 9. Charge Pump Off in DCM
CH4: FCCM(5V/div) ; 100uS/div
Figure 11. DCM/FCCM Transition
Page 8 of 20
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IR Confidential
4/26/10
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