Overview:
Switching DC/DC converters use fixed-frequency clocks whose duty cycle
varies as a function of input voltage and load current. For properly designed
modular DC/DC converters, the min./max. duty cycle information is not
relevant to most applications. If one is already set up to measure input
inrush or ripple currents, it is simple to observe and calculate the converter
duty cycles to verify proper functioning.
Procedure:
To determine the minimum duty cycle, set the input voltage and the output
current to Vin (max.) and Iout (min.), respectively. The minimum duty
cycle is determined as the ratio of the time during which the input current
increases to the total period of the input current ripple. To determine
the maximum duty cycle, set the input voltage and the output current to
Vin (min.) and Iout (max.) respectively. The maximum duty cycle is determined
using the ratio of the time during which the input current increases to
the period of the input current ripple.
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