| 摘要 |
<p>Techniques are disclosed to limit the current in a switch of a switching power supply. An example switching regulator circuit includes a switch (120) to be coupled to an energy transfer element (125). A controller (145) is coupled to the switch (120) to control switching of the switch (120). A current sensor is included in the controller (145). The current sensor includes first and second comparators (604, 605) coupled to compare a current in the switch (120) with first and second current limits, respectively. The controller (145) is to open the switch (120) for a remainder of a current switching cycle of the switch (120) until a next switching cycle of the switch (120) in response to the first or second comparators (604, 605). A frequency adjuster is also included in the controller (145) and coupled to the second comparator (605). The frequency adjuster is to adjust an oscillating frequency of an oscillator (640) included in the controller in response to the second comparator (605).</p> |
