| 摘要 |
A switched-mode power supply with a burst mode comprises an integrated circuit (Ic) with tree terminals (T1, T2, T3). The integrated circuit comprises a switching element (S) for periodically switching on and off the current (Id) in a primary winding (Lp) of a transformer (T), and a control circuit (Cc) for controlling the switching element. The current path of the switching element is arranged between two of the terminals (T1, T2). A capacitor (C1) is connected to the third terminal (T3). Its voltage (Vc) is used as power voltage for the control circuit, as well as control value for switching the current when it is lower than a predetermined value (Vp) and for keeping the switch in a non-conductive state when it exceeds this predetermined value.
|
