SC403MLTRT View Datasheet(PDF) - Semtech Corporation
Part Name
Description
MFG CO.
'SC403MLTRT' PDF : 32 Pages View PDF
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 VIN as losses increase). The on-time is essen-
tially constant for a given VOUT/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.
SC403
27
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