公开(公告)号：DE60009892D1

公开(公告)日：2004-05-19

申请号：DE60009892

申请日：2000-07-31

Applicant: ST MICROELECTRONICS SRL

Inventor： BONTEMPO GREGORIO ,  ADRAGNA CLAUDIO ,  FAGNANI MAURO ,  PIDUTTI ALBINO ,  PULVIRENTI FRANCESCO ,  QUAGLINO ROBERTO ,  GATTAVARI GIUSEPPE

IPC: H02M1/00 ,  H02M3/28 ,  H02M3/335

公开(公告)号：DE69724094D1

公开(公告)日：2003-09-18

申请号：DE69724094

申请日：1997-04-09

Applicant: ST MICROELECTRONICS SRL

Inventor： ADRAGNA CLAUDIO ,  GATTAVARI GIUSEPPE ,  FAGNANI MAURO

IPC: H02M3/28 ,  H02M3/335 ,  H04N3/185

Abstract: The power output of a static DC_DC converter employing a current mode PWM controller is controlled upon the varying of the switching frequency, by detecting the sawtooth signal produced by the local oscillator generating a DC signal with amplitude inversely proportional to the frequency and by alternatively clamping the output voltage of the error amplifier of the PWM controller at a voltage proportional to the amplitude of said DC signal or by offsetting the signal present on the currents sensing resistor by a voltage corresponding to the difference between a constant voltage and said DC signal.