Cycle by cycle synchronous buck converter control based on external clock
First Claim
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1. A DC-DC voltage converter comprising:
- a primary side and a secondary side coupled to said primary side, said secondary side including a step-down converter, said step-down converter comprising;
a switching stage including high- and low-side switches connected in series at a switched node across a DC voltage bus;
a control circuit; and
a feedback loop connected between an output of the switching stage and an input of the control circuit, the control circuit having a clock signal input and including an error processing circuit coupled to the input for detecting an output of the feedback loop, the control circuit operable to generate PWM modulation and operable to turn OFF the low-side switch and turn ON the high-side switch independent of the output of the switching stage when the clock signal input is detected, wherein in each cycle of PWM modulation the control circuit synchronizes PWM modulation to an external clock source;
wherein said step-down converter is externally synchronizable on said secondary side and operates independently from said primary side.
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Abstract
A DC-DC voltage converter having a switching stage including high- and low-side switches connected in series at a switched node across a DC voltage bus; a control circuit; and a feedback loop connected between an output of the switching stage and an input of the control circuit, the control circuit having a clock signal input and including an error processing circuit coupled to the input for detecting an output of the feedback loop, the control circuit turning OFF the low-side switch and turning ON the high-side switch when the clock signal is detected. The control circuit operates in a cycle-by-cycle operation generating PWM modulation synchronous to the external clock source.
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Citations
10 Claims
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1. A DC-DC voltage converter comprising:
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a primary side and a secondary side coupled to said primary side, said secondary side including a step-down converter, said step-down converter comprising; a switching stage including high- and low-side switches connected in series at a switched node across a DC voltage bus; a control circuit; and a feedback loop connected between an output of the switching stage and an input of the control circuit, the control circuit having a clock signal input and including an error processing circuit coupled to the input for detecting an output of the feedback loop, the control circuit operable to generate PWM modulation and operable to turn OFF the low-side switch and turn ON the high-side switch independent of the output of the switching stage when the clock signal input is detected, wherein in each cycle of PWM modulation the control circuit synchronizes PWM modulation to an external clock source; wherein said step-down converter is externally synchronizable on said secondary side and operates independently from said primary side. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification