MV1001SC

21

5.1 Operation in each mode

5.1.1

[A] Frequency modulation region

The operation waveforms in the frequency modulation region are those in critical conduction mode shown in Figure 15.

If resonant period Toff2 is significantly less than ton and toff1, IL may be regarded as a triangle wave. Thus, Io = 1/2 x Ip,

ratios of Toff2 and detection delay to the period of a cycle will therefore increase. In this case, the proportional relationship

Figure 14 CS pin internal circuit diagram

Figure 15 Operation waveforms in [A] frequency modulation region

3

4

-

+

CS

GND

Vth_CS

=0.495V

3

4

-

+

CS

GND

≥ 2.6V (dimming ratio of 100%)

CAT.No.1A0102-1E