公开(公告)号：EP1469581A1

公开(公告)日：2004-10-20

申请号：EP03425232.0

申请日：2003-04-14

Applicant: STMicroelectronics S.r.l.

Inventor： Adragna, Claudio ,  Favagni, Mauro

IPC: H02M1/00 ,  H02M3/335

CPC classification number: H02M1/36 ,  Y10S323/901

Abstract: The present invention refers to the switching power supply and particularly to the integrated circuits used for the control of such power supplies. It refers more particularly to a control circuit of the minimum working voltage of the integrated control circuits of such power supplies.
In one embodiment the control circuit of the minimum working voltage of the integrated control circuit of a switching power supply having a supply voltage (Vcc); characterized in that said minimum working voltage can assume a first voltage value (Vstop1) and a second voltage value (Vstop2); said first voltage value (Vstop1) is higher than said second voltage value (Vstop2); said minimum working voltage switches from said first voltage value (Vstop1) to said second voltage value (Vstop2) in case of low or null load of said switching power supply; said minimum working voltage switches from said second voltage value (Vstop2) to said first voltage value (Vstop1) if the load is higher than a prefixed load of said switching power supply and at the same time said supply voltage (Vcc) is higher than said first voltage value (Vstop1).

Abstract translation: 本发明涉及开关电源，特别涉及用于控制这种电源的集成电路。 更具体地，涉及这种电源的集成控制电路的最小工作电压的控制电路。 在一个实施例中，具有电源电压（Vcc）的开关电源的集成控制电路的最小工作电压的控制电路; 其特征在于，所述最小工作电压可以采用第一电压值（Vstop1）和第二电压值（Vstop2）; 所述第一电压值（Vstop1）高于所述第二电压值（Vstop2）; 所述最小工作电压在所述开关电源的低负载或零负载的情况下从所述第一电压值（Vstop1）切换到所述第二电压值（Vstop2）; 如果负载高于所述开关电源的预定负载，则所述最小工作电压从所述第二电压值（Vstop2）切换到所述第一电压值（Vstop1），并且同时所述电源电压（Vcc）高于所述 第一电压值（Vstop1）。