| 摘要 |
<p>A switching regulator (18) for use in a switching power supply (10) receives a feedback signal and provides a gate drive signal. The switching regulator enables the gate drive signal once at any point during a cycle of an oscillator signal by setting a first latch (74) upon receiving a non-asserted feedback signal. Setting the first latch triggers a pulse generator (78) to generate a pulse signal. The first latch is not reset until the end of the cycle of the oscillator signal. Therefore, the pulse generator can generate only one pulse per oscillator cycle. The pulse signal sets a second latch (80) that enables the gate drive signal. The switching regulator disables the gate drive signal by resetting the second latch. A power transistor (20) conducts an inductor current through the primary winding of the transformer (16) in response to the gate drive signal.</p> |
