MC34280 Datasheet, PDF (12/20 Pages) ON Semiconductor – Power Supply & Management IC for Handheld Electronic Products

MC34280
Cycle Starts
VREF
Feedback Voltage
tdl
M1 ON
tdh
M2 OFF
Ipk
M1 OFF
M2 ON
M1 ON
M2 OFF
TON
Loading Current, ILOAD
Coil Current
TSW
VMAIN
VMAIN + 1 V
M1 OFF
M2 ON
M1 ON
M2 OFF
M1 OFF
M2 ON
V@SW
0V
VMAIN Zoom–In
Feedback Voltage
VREF
tdl
Figure 21. Waveforms of Continuous Conduction Mode
Cycle Starts
M1 ON
M2 OFF
M1 OFF
tdh
M1 ON
M2 OFF
M1 OFF
M1 ON
M2 OFF
Ipk
TON
Loading Current, ILOAD
Coil Current
VMAIN + 1 V
VMAIN
V@SW
TSW
VIN
0V
VMAIN Zoom–In
Figure 22. Waveforms of Discontinuous Conduction Mode
http://onsemi.com
12
M1 OFF