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i design the buck-boost with 4 switchs inside, i want use voltage mode, but how to design the ramp signal and the EA output level shift for buck control?
He buddy!
Hi
You can take an integral from square wave to make a triangular wave, that it is enough to make PWM signal for your aim.
for example with miller integrator. you should know that your triangular wave should has DC signal. ( my mean is your triangle wave should become between zero and +vcc. ( have not negative). and you can use a comparator , like LM311 . and your triangle will being in V- (inverting input) of comparator and your DC feed back will being at V+ ( non inverting input).
Best Regards
Goldsmith
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