Method and System for Increasing Efficiency and Controlling Slew Rate in DC-DC Converters

摘要

One embodiment pertains to a method including transitioning a logic state of at least one enable signal. A first power transistor begins to turn off. A parameter level of the input of the first power transistor is directly sensed. A second power transistor is turned off when the parameter level is less than a threshold level.

主权项

1. An apparatus, comprising:
a first driver having first and second inputs, and first and second outputs; wherein the first output is configured to be coupled to a first terminal of a first slew resistor having a second terminal coupled to an input of a first power transistor; wherein the second output is configured to be coupled to a third terminal of a second slew resistor having a fourth terminal coupled to the input of the first power transistor; a second driver having third and fourth inputs and third and fourth outputs; wherein the third output is configured to be coupled to a fifth terminal of a third slew resistor also having a sixth terminal coupled to an input of a second power transistor; wherein the fourth output is configured to be coupled to a seventh terminal of a fourth slew resistor also having an eighth terminal coupled to an input of the second power transistor; wherein the first output is coupled to the fourth input; wherein the third output is coupled to the second input; wherein the first input is configured to receive an enable signal; wherein the third input is configured to receive a complementary enable signal; wherein the first output is configured to directly sense a voltage at the input of the first power transistor upon the first power transistor beginning to be turned off; and wherein the third output is configured to directly sense a voltage at the input of the second power transistor upon the second power transistor beginning to be turned off.