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SC403 Scheda tecnica(PDF) 27 Page - Semtech Corporation

Il numero della parte SC403
Spiegazioni elettronici  6A EcoSpeedTM Integrated FET Regulator with Programmable LDO
PDF  32 Pages
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Produttore elettronici  SEMTECH [Semtech Corporation]
Homepage  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

SC403 Scheda tecnica(HTML) 27 Page - Semtech Corporation

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SC403
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Applications Information (continued)
The switching frequency also varies with load current as a
result of the power losses in the MOSFETs and the induc-
tor. For a conventional PWM constant-frequency con-
verter, as load increases the duty cycle also increases
slightly to compensate for IR and switching losses in the
MOSFETs and inductor. A constant on-time converter
must also compensate for the same losses by increasing
the effective duty cycle (more time is spent drawing
energy from V
IN as losses increase). The on-time is essen-
tially constant for a given V
OUT/VIN combination, to offset
the losses the off-time will tend to reduce slightly as load
increases. The net effect is that switching frequency
increases slightly with increasing load.



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