Sawtooth signal generator for switched-mode power supply, has resistor including switched capacitor circuit that is switched by two complementary clock signals, where period of each clock signal is equal to duration of charging period

摘要

The generator (GEN) has a resistor to be traversed by load current, and a capacitor (C1) intended to be charged by charging current during charge periods, where the resistor includes a switched capacitor circuit (CCOM). The switched capacitive circuit includes a ballast capacitor (C3) where the switched capacitive circuit is switched by complementary clock signals (CK, CKB), and a period of each complementary clock signal is equal to the duration of the charging period.