ELECTRONIC DEVICE AND METHOD FOR DC-DC CONVERSION
First Claim
1. An electronic device for DC-DC conversion comprising:
- a feedback loop coupled at one side to the inductor for measuring a current through the inductor by a series of an auxiliary capacitor and an auxiliary resistor;
a transconductance stage coupled to the auxiliary capacitor for generating a current proportional to a voltage drop across the auxiliary capacitor, wherein the electronic device further comprises a ramp resistor coupled to the output of the transconductance stage for generating a ramp voltage across the ramp resistor and a comparator receiving at a first input the ramp voltage, wherein the output of the comparator is coupled to a gate driving stage for driving a power transistor being coupled with a control gate to the gate driving stage and with a channel to a switching node of the electronic device.
2 Assignments
0 Petitions
Accused Products
Abstract
An electronic device for DC-DC conversion including a feedback loop coupled at one side to the inductor for measuring a current through the inductor with a series of an auxiliary capacitor and an auxiliary resistor, a transconductance stage coupled to the auxiliary capacitor for generating a current proportional to a voltage drop across the auxiliary capacitor, wherein the electronic device further includes a ramp resistor coupled to the output of the transconductance stage for generating a ramp voltage across the ramp resistor and a comparator receiving at a first input the ramp voltage, wherein the output of the comparator is coupled to a gate driving stage for driving a power transistor coupled with a control gate to the gate driving stage and with a channel to a switching node of the electronic device.
14 Citations
8 Claims
-
1. An electronic device for DC-DC conversion comprising:
-
a feedback loop coupled at one side to the inductor for measuring a current through the inductor by a series of an auxiliary capacitor and an auxiliary resistor; a transconductance stage coupled to the auxiliary capacitor for generating a current proportional to a voltage drop across the auxiliary capacitor, wherein the electronic device further comprises a ramp resistor coupled to the output of the transconductance stage for generating a ramp voltage across the ramp resistor and a comparator receiving at a first input the ramp voltage, wherein the output of the comparator is coupled to a gate driving stage for driving a power transistor being coupled with a control gate to the gate driving stage and with a channel to a switching node of the electronic device. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. A method of performing DC-DC conversion, comprising the steps of:
-
measuring a voltage drop across auxiliary capacitance which is coupled in series with an auxiliary resistor and the series of the auxiliary capacitance and the auxiliary resistor are coupled in parallel to an inductor; generating a current as a function of the voltage drop across the auxiliary capacitor; feeding the current to a ramp resistor, comparing the voltage drop across the ramp resistor with a reference voltage being indicative of an output voltage of the DC-DC conversion; and using the comparison result for switching a power transistor used for the DC-DC conversion.
-
Specification