| 摘要 |
DC-DC converter PWM controllers and dual counter digital integrators (40) are presented for integrating an error between a reference voltage signal and a feedback voltage signal (FB), in which a comparator (48), dual counters (100,104), and a DAC (60) are used to provide a compensated reference (38) to a modulator loop comparator (36) which generates a PWM switching signal for controlling a power converter output voltage (Vout), with the second counter (104 )being selectively incremented or decremented when the first counter output indicates a predetermined value (100000) after the first counter output transitions in one direction through a predetermined count range to enhance loop stability, and a startup mode control (START) allows fast integrator operation during initialization, with the ability to freeze integrator operation during overcurrent conditions. |
