MV1001SC

24

5.1.3

[C] Minimum dimming region

operates with the fixed minimum on-time, Ton_min, and the fixed maximum off-time, Toff_max, rather than depending in

the switching-off and switching-on timings detected using the CS pin, Svin pin, and Svout pin voltages. The output current

Io (min) in the [C] region is fixed to about 0.1 to 1% of that at the 100% dimming ratio.

However, since peak current detection is not used, Io (min) will change if the input voltage or output voltage changes.

Figure 21 Operation waveform in the [C] minimum dimming region

Io

Vi-Vo

t

t

Maximum off-time

Minimum on-time

t

CAT.No.1A0102-1E