SC403 datasheet(27/32 Pages) SEMTECH

部件名	SC403

功能描述	6A EcoSpeedTM Integrated FET Regulator with Programmable LDO

PDF	32 Pages

Scroll/Zoom	100%

制造商	SEMTECH [Semtech Corporation]

网页	http://www.semtech.com

标志

27 / 32 page

SC403

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.

SC403 数据表(PDF) 27 Page - Semtech Corporation