LMZ14202_15 Datasheet, PDF (13/31 Pages) Texas Instruments – SIMPLE SWITCHER 6V to 42V, 2A Power Module in Leaded SMT-TO Package

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LMZ14202
SNVS648J – JANUARY 2010 – REVISED OCTOBER 2015
7.4 Device Functional Modes
7.4.1 Discontinuous Conduction and Continuous Conduction Modes
At light-load, the regulator operates in discontinuous conduction mode (DCM). With load currents above the
critical conduction point, it operates in continuous conduction mode (CCM). When operating in DCM the
switching cycle begins at zero amps inductor current; increases up to a peak value, and then recedes back to
zero before the end of the OFF-time. During the period of time that inductor current is zero, all load current is
supplied by the output capacitor. The next ON-time period starts when the voltage on the FB pin falls below the
internal reference. The switching frequency is lower in DCM and varies more with load current as compared to
CCM. Conversion efficiency in DCM is maintained because conduction and switching losses are reduced with
the smaller load and lower switching frequency.
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