Current controlling mode direct current (DC)-DC converter
AssigneeMagnaChip Semiconductor, Ltd.
InventorsJun Sik Min, Hyoung Kyu Kim
Life of this patent
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Abstract
There is provided a current controlling mode DC-DC converter that operates in a PWM mode or a PFM mode by adjusting a turned-on time of a gate depending on power consumption of a load. The DC-DC converter includes a first comparator that receives a first input voltage and a second input voltage and outputs a first output signal, a second comparator that receives a reference voltage for mode switching and the second input voltage and outputs a second output signal, and a first logic element that outputs a reset signal for turning off a gate at a point of time when both the first output signal and the second output signal are applied. Examples may also include additional elements to facilitate mode switching.
Claims20
A direct current (DC)-DC converter, comprising:
- a first comparator configured to receive a first input voltage and a second input voltage and to output a first output signal;
- a second comparator configured to receive a reference voltage configured to indicate mode switching and the second input voltage and to output a second output signal, wherein the second input voltage is based on a sensing signal and a ramp signal;
- and
- a first logic element configured to output a reset signal based upon a determination that both the first output signal and the second output signal are applied to the first logic element, wherein the reset signal is configured to turn off a gate.
A direct current (DC)-DC converter, comprising:
- a first comparator configured to receive a first input voltage and a second input voltage and to output a first output signal;
- a second comparator configured to receive a reference voltage for mode switching and the second input voltage and to output a second output signal;
- a first logic element configured to output a reset signal based upon a determination that both the first output signal and the second output signal are applied to the first logic element, wherein the reset signal is configured to turn off a gate;
- and
- a second logic element configured to output a set signal based upon a determination that a clock signal and an inverted first output signal are applied to the second logic element, wherein the set signal is configured to turn on the gate,
- wherein the DC-DC converter switches between modes by outputting a reset signal for a gate at a point in time at which both the first output signal and the second output signals are applied, and
- wherein the DC-DC converter changes from Pulse Width Modulation (PWM) mode to Pulse Frequency Modulation (PFM) mode or from PFM mode to PWM mode in a section of gate operation in which the first input voltage is equal to the reference voltage.
Dependencies are inferred from the claim text.