| 主权项 |
1. A control circuit (110; 710) of a power converter (100; 700; 800; 900), the power converter (100; 700; 800; 900) comprising an inductor (120), a first power switch (130), and a feedback circuit (160), wherein the first power switch (130) is utilized for controlling the inductor (120) to store or release energy to convert an input signal (VIN) into an output signal (VOUT), and the feedback circuit (160) is utilized for generating a feedback signal (VFB) corresponding to a magnitude of the output signal (VOUT), the control circuit (110; 710) comprising:
a comparing circuit (111) comprising a first input terminal and a second input terminal and configured to operably generate a comparison signal (CMP) according to signals received by the first input terminal and the second input terminal, wherein the first input terminal is utilized for coupling with a reference signal (VREF) while the second input terminal is utilized for coupling with the feedback signal (VFB); a periodic signal generating circuit (113), coupled with the comparing circuit (111), configured to operably generate a periodic signal (RAMP) and apply the periodic signal (RAMP) to the first input terminal or the second input terminal of the comparing circuit (111); and a control signal generating circuit (115), coupled with the comparing circuit (111), configured to operably control an on time of the first power switch (130) according to the comparison signal (CMP); wherein the periodic signal generating circuit (113) is further configured to operably clamp a limit of the periodic signal (RAMP) to a predetermined value, but does not configure a slope of the periodic signal (RAMP) to be zero when there is no current passing through the inductor (120). |
