The AP3103 is a low startup 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
tigh 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 ‘skip mode’ to minimize switching loss.
About 20kHZ frequency switching is aviode the audible noise as well as reduding the standby loss.
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