Datasheet
SLUS446B – MAY 2000 – REVISED DECEMBER 2000
14
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
APPLICATION INFORMATION
UDG–00052
I
L
0
0
V
SW
V
IN
V
OUT
CHARGE FREEWHEEL
DIODE DIODE
FET
0
Figure 5. Typical Constant-Frequency Mode Circuit Waveforms
UDG–00051
I
L
0
0
V
SW
V
IN
V
OUT
200mA
ZERO CURRENT
DETECTIONLEVEL
ANTICIPATES ZERO
CURRENT FOR
TURNOFF
FIXED 200mA
PEAK CURRENT
AVERAGE I
OUT
IS 100mA MAXIMUM
0
CHARGE FREEWHEEL
DIODE DIODE
FET
Figure 6. PFM Circuit Waveforms (Expanded View)