Patent ID: 6717374
Filing Date: 2004-04-06
Classification: H05B

Abstract:
A microcontroller having at least one device (E, G) for controlling a switched-mode power supply, characterized in that the at least one device (E, G) hasa device (SQ1, SS1; SQ2, SS2) for the alternate charging and discharging of a charge store (C27; C26) that can be connected to the microcontroller (MC) or integrated into the microcontroller (MC), wherein the device (SQ1, SS1; SQ2, SS2) has: (i) a controllable current source (SQ1; SQ2) for applying an adjustable charging current to the charge storage capacitance (C27; C26); and (ii) a controllable current sink (SS1; SS2) for applying an adjustable discharging current to the charge storage capacitance (C27; C26), control means for the device (SQ1, SS1; SQ2, SS2) for controlling the charging operations and the discharging operations, and evaluation means which are used to evaluate the time periods required for recharging the charge storage capacitance (C27; C26) between different charge states and, on this basis, to generate at least one of: (i) a pulse-width modulation control signal; and (ii) a frequency control signal.