ir3840 International Rectifier Corp., ir3840 Datasheet - Page 24

• Manufacturer Part Number: ir3840
• Description: Integrated 12a Synchronous Buck Regulator
• Manufacturer: International Rectifier Corp.

02/09/09
TYPICAL OPERATING WAVEFORMS
Vin=12.0V, Vcc=5V, Vo=1.8V, Io=0-12A, Room Temperature, No Air Flow
Fig. 21. Inductor node at 12A load
Fig. 19. Start up with 1.62V Pre
Bias, 0A Load, Ch
Fig. 17. Start up at 12A Load
Ch
1
:V
o
Ch
, Ch
4
Ch
:Enable
2
:V
3
:LX
in
, Ch
1
:V
o
, Ch
3
:V
ss
3
,
:V
SS
Fig. 20. Output Voltage Ripple, 12A
Ch
Fig. 22. Short (Hiccup) Recovery
1
Fig. 18. Start up at 12A Load,
:V
o
, Ch
Ch
load Ch
1
2
:V
:V
out
in
, Ch
, Ch
IR3840MPbF
2
: V
3
:V
3
:V
out
ss
SS
, Ch
4
:V
PGood
24