Ncp1217: Universal Ac 40 W Programmable Output

This programmable output voltage adapter is designed around the NCP1217 PWM switcher. This flyback converter operated in the DCM for the full range of output to 44 watts. This permits the primary current limit to function as the secondary power limit. The adapter is designed to provide an output of 9 Vdc nominal with no jumper connections. This gives the system the security of a low voltage default output. A single jumper may be installed in only one of the three positions shown to program the output. The current/power sense resistor section has resistors R10 and R11 to permit “break-off” trimming options. The schematic shows optional Y caps in pink for systems with a three-wire power cord. The earth return provides additional margin for applications that require more EMI filtering or earth ground safety connection.
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Ncp1217: Universal Ac 40 W Programmable Output application circuits
Ncp1217: Universal Ac 40 W Programmable Output application circuits



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