基于AP3103的离线式AC-DC电源模块设计

The AP3103 is a low start-up current, current-mode

PWM controller with green-mode power-saving

operaTIon. The PWM switching frequency at normal

operaTIon is externally programmable and is trimmed

to a TIght range. The dithering of frequency will

improve EMI feature. When the load decreases, the

frequency will reduce and when at a very low load, the

IC will enter the “burst mode” to minimize switching

loss. About 20kHz frequency switching is to avoid the

audible noise as well as reducing the standby loss.