摘要:
A novel method to generate a feedback signal in a switching regulator is presented. The method includes the generation of a first feedback signal using the switching signal. The first feedback signal carries a ripple and the ripple is in phase with the switching signal. The first feedback signal does not use a control-in terminal PIN. The voltage level of the first feedback signal is regulated through a resistor and a capacitor connected between the switching node and the switching regulator controller. In an alternative method, a second feedback signal is generated using the regulator output voltage. The controller receives the second feedback through a control-in terminal PIN. In the alternative method, another resistor and another capacitor are used to connect the first feedback signal and the second feedback signal. Furthermore, the second feedback signal can adjust the regulator output voltage through two resistors connected in series. The subject invention is designed to operate in the Continuous Conduction Mode (CCM) where the load is significant and the inductor current remains positive during the entire switching period. The method is presented for buck switching regulators, and can be utilized also for boost, buck-boost, flyback, forward, and sepic, etc.
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