Fixed frequency DC-DC converter
By introducing a transient enhancement circuit into a fixed-frequency DC-DC converter, a ripple voltage is generated and superimposed to control the turn-on and turn-off of the power transistor, thus solving the delay problem of the fixed-frequency DC-DC converter during load changes and achieving fast response and improved stability.
CN117081362BActive Publication Date: 2026-05-29SG MICRO CORP
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- SG MICRO CORP
- Filing Date
- 2023-08-08
- Publication Date
- 2026-05-29
Smart Images
Figure CN117081362B_ABST
Abstract
The present disclosure provides a kind of fixed frequency DC-DC converter, including PWM drive circuit, upper power tube, lower power tube, output circuit, error amplifier circuit, transient enhancement circuit and pulse width modulation comparator;Wherein, PWM drive circuit generates PWM signal according to the output signal of pulse width modulation comparator, and generates the first drive signal of upper power tube and the second drive signal of lower power tube according to PWM signal;Transient enhancement circuit is configured to generate first ripple voltage, the feedback voltage on second node is superimposed with first ripple voltage to generate second ripple voltage, and the reference voltage of second ripple voltage and second ripple voltage is output to pulse width modulation comparator;Pulse width modulation comparator is configured to compare second ripple voltage and the reference voltage of second ripple voltage, generate first comparison signal, and based on first comparison signal, the output signal of error amplifier circuit and the reference voltage of output signal are compared, and second comparison signal is output to PWM drive circuit.
Need to check novelty before this filing date? Find Prior Art