The invention provides a constant on-time generation circuit with
delay compensation, which is suitable for a DC-DC controller in a self-adaptive constant on-
time control mode, and belongs to the technical field of
integrated circuit design. According to the technical scheme, the charging current of the
capacitor is mirrored through one circuit, the
voltage of the charging
branch and the
voltage of the output
voltage branch are respectively adjusted through the two compensation resistors, and the adjusted voltage is respectively supplied to the in-phase comparison end and the reverse-phase comparison end of the
comparator. By means of the mode, time
delay caused by the
comparator in the DC-DC controller in the constant on-
time control mode can be effectively compensated, the constant on-time
TON is more accurate, the problem that the working frequency is unstable when input / output voltage fluctuates due to the time
delay of the
comparator is effectively solved, meanwhile, resistance matching can be achieved on the
layout, and the reliability of the DC-DC controller in the constant on-
time control mode is improved. Deviation caused by mismatch at different
process corners is reduced, and stable work can be maintained at different
process corners.