Hi Frank, 1) The +50V & -50V don't have to power on simultaneously. 2) -50V doesn't need to be power on before +50V as long as Vsub is powered on first. 3) A little noise on the power supply shouldn't damaged the devices. Sorry that you are stuck. I'll try to help as best as I can. Did you set the current limit on all your supplies, especially VSUB? If you set current limit on VSUB to be less than 10mA, you might damaged it part during power up. To be on the safe side, I would set the current limit to 100mA for VSUB. Are you setting the LM96570 in CW mode? You can't be in CW mode if your VPP & VNN is +50V & -50V, respectively. How are your supplies set up? Are they similar to the attached setup? (Please visit the site to view this file)
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