gm\how dcm inrease efficiency in buck converter
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Abstract—This paper develops a multimode control strategy
which allows for efficient operation of the buck converter over a
wide load range. A method for control of synchronous rectifiers
as a direct function of the load current is introduced [1]. The
function relating the synchronous-rectifier timing to the load cur-
rent is optimized on-line with a gradient power-loss-minimizing
algorithm. Only low-bandwidth measurements of the load cur-
rent and a power-loss-related quantity are required, making the
technique suitable for digital controller implementations. Com-
pared to alternative loss-minimizing approaches, this method has
superior adjustment speed and robustness to disturbances, and
can simultaneously optimize multiple parameters. The proposed
synchronous-rectifier control also accomplishes an automatic,
optimal transition to discontinuous-conduction mode at light
load. Further, by imposing a minimum duty-ratio, the converter
automatically enters pulse-skipping mode at very light load. Thus,
the same controller structure can be used in both fixed-frequency
pulsewidth modulation and variable-frequency pulse-skipping
modes. These techniques are demonstrated on a digitally-con-
trolled 100-W buck converter
which allows for efficient operation of the buck converter over a
wide load range. A method for control of synchronous rectifiers
as a direct function of the load current is introduced [1]. The
function relating the synchronous-rectifier timing to the load cur-
rent is optimized on-line with a gradient power-loss-minimizing
algorithm. Only low-bandwidth measurements of the load cur-
rent and a power-loss-related quantity are required, making the
technique suitable for digital controller implementations. Com-
pared to alternative loss-minimizing approaches, this method has
superior adjustment speed and robustness to disturbances, and
can simultaneously optimize multiple parameters. The proposed
synchronous-rectifier control also accomplishes an automatic,
optimal transition to discontinuous-conduction mode at light
load. Further, by imposing a minimum duty-ratio, the converter
automatically enters pulse-skipping mode at very light load. Thus,
the same controller structure can be used in both fixed-frequency
pulsewidth modulation and variable-frequency pulse-skipping
modes. These techniques are demonstrated on a digitally-con-
trolled 100-W buck converter
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