| US 7,432,695 B2 | ||
| Adaptive power control for hysteretic regulators | ||
| David Charles Salerno, New Boston, N.H. (US) | ||
| Assigned to Linear Technology Corporation, Milpitas, Calif. (US) | ||
| Filed on Apr. 18, 2005, as Appl. No. 11/107,739. | ||
| Prior Publication US 2006/0232256 A1, Oct. 19, 2006 | ||
| Int. Cl. G05F 1/40 (2006.01) | ||
| U.S. Cl. 323—284 [323/288; 323/277] | 18 Claims |
| 1. A method for controlling a DC/DC regulator comprising the steps of:
setting the regulator to an active operational mode in which charge is applied to an output node of the regulator by a current
having a current limit value when the voltage at the output node falls to a first threshold level;
setting the regulator to an inactive operational mode when the voltage at the output node rises to a second threshold level;
and
automatically adjusting the current limit value as a function of a duty cycle indicating a percentage of time of the active
or inactive operational mode,
wherein the step of automatically adjusting comprises:
charging a capacitor during the active operational mode of the regulator;
discharging the capacitor during the inactive operational mode of the regulator;
sensing the voltage of the capacitor; and
varying the current limit value in accordance with the sensed capacitor voltage.
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