at 13:32. I have a 12V, 1A DC power source. Its measured DC output voltage with no load (0A) is 22V. But just as its label says, it outputs 12V DC when delivering 1A instead of 0A. It is possible that your bigger 12V 2.5A power source is putting out more than 12V when loaded with your keyboard.
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Itcan be configured as a boost, SEPIC or inverting converter.The LT3759 drives a low side external N-channel power MOSFET. V IN = 2.8V to 36V, V OUT = 12V @ 1A. DC1725A. LT3759EMSE Boost Demo Board | V IN = 1.8V to 4.5V, V OUT = 5V @ 2A Automotive SEPIC Converter (2.5-36V to 12V @ 2A) LT3759 Demo Circuit - SEPIC Converter with Wide12Voutput assuring the complete insulation between the input and the output. A transil snubber circuit (D6-D7), allows to have a reliable protection for spikes voltage due to the reflected voltage and the leakage inductance. Figure 4. Air-Conditioner SMPS Schematic 100nF/275VAC C1 1A/275VAC F1 22uF/50V C5 Control FB Vdd Drain Source VIPer22A
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