| http://www.w3.org/ns/prov#value | - The power source voltage VDD is a low voltage such as approximately 5V and is an operational voltage of an error amplifier EA, a voltage comparator CMP and a triangular wave generating circuit TWG which constitute the PWM control circuit including theabove-mentioned control circuit CONT, wherein the power source voltage VDD is also used as an operational voltage of low-voltage-side circuits of lev
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