MV1012SC

8

3. Component selection procedure and calculation method

The calculation is an estimate. In an actual circuit, errors may occur for various reasons, including the characteristics of

individual parts and IC detection delays. Be sure to check with the actual apparatus and to make any adjustments needed.

When using an oscilloscope to verify waveforms, note that the waveform and characteristics change depending on

probe capacitance. In particular, pay close attention when measuring the Svin, Svout, and CS pins, and D-S of the

MOSFET.

Unless otherwise specified, the figures used in this document are typical values.

3.1 Basic circuit configuration

Figure 4 shows the basic circuit configuration. Figure 5 shows the basic operation waveforms.

As shown in Figure 4, detecting the voltages on both ends of the choke eliminates the need for an auxiliary winding and

enables a simple, low-cost circuit configuration.

Figure 4 Basic circuit configuration

Figure 5 Basic operation waveforms

ton

toff1

toff2

Ip

Io

Vi-Vo

（*）The chart emphasizes the toff2 period.

IL(Current waveform of L)





Ip

Vo

Vi

L

ton











Ip

V

Vo

L

1

toff

F







CAT.No.1A0602-1E