SWITCHED MODE POWER SUPPLY CONTROL

摘要

In an integrated circuit (IC) for providing an enabling signal (EN) to a converter, the integrated circuit (IC) comprising: a monitoring circuit (FET1, R2, D1, Io, M, S1) for providing a control signal (CS) in response to a level of a line voltage (Vline) on a first connection terminal (8) of the integrated circuit (IC), and a start-up circuit (FET2, Istrt up, Vcc strt-Lev, COMP, S2) for providing the enabling signal (EN) to the converter in response to the control signal (CS) and a generated voltage level (Vcc), said generated voltage level (Vcc) being generated in response to the level of the line voltage (Vline) on the first connection terminal (8), the monitoring circuit and the start-up circuit are sensing the level of the line voltage (Vline) only via the first connection terminal (8).