The HV9922DB2 is a universal input, offline, non-isolated auxiliary power supply using Supertex’s HV9922 constant current switching regulator IC. The output voltage is regulated to 23V +/-5% and is referenced to the negative side of the diode bridge rectifier (i.e. ground of the rectified DC voltage). The demoboard is protected against output open circuit and short circuit conditions and meets FCC Class B (residential) EMI limits.