MV1012SC

23

5.1.3

[C] Oscillation off region

(Vth_REF_sp). To turn the MOSFET completely off, Io can be brought closer to zero than in the [B] region.

In the basic circuit configuration shown in Figure 4, a leakage current flows constantly via the internal resistors of the

Svin and Svout pins. A leakage current is also present in the [A] and [B] regions. In the [C] region, in which the MOSFET is

completely off, Io is just the leakage current. The value of the leakage current is determined by the input/output voltage

difference and the values of resistors R5 to R8. To eliminate the leakage current, use the circuit configuration with an

auxiliary winding.

Figure 20 Operation waveform in the [C] Oscillation off region

CAT.No.1A0602-1E