Chopper-Type Switching Regulator Circuit - Epson L-1000 Technical Manual

REV.-A

2.2.1.2 Chopper-Type Switching Regulator Circuit

A chopper-type switching regulator is employed in the power supply circuit. Operation of the step-down circuit
is as follows:
Figure 2-10 shows the chopper-type, step-down switching regulator circuit. When the transistor is ON, voltage
Vi is applied to coil L and capacitor C, and load current
accumulated in choke coil L. When the transistor turns off, energy
D so that output voltage Vo becomes the average value:
LQ-500/L-1000
Figure 2-10. Step-Down Circuit
flows. At this time, electromagnetic energy
I
L
Figure 2-11. Step-Down Timings
PRINCIPLES OF OPERATION
W
is applied to the load via flywheel diode
L
W
is
L
2-11