1. 12/2/2001Ivan Hruska & Georges Blanchot1 LV power supply for TILECAL Requirements –7 outputs for one drawer (+5V, -5V,+15V,- 15V,+3.3V) –total power is 230W –low ripple ( <100mVpp for digital part, <3mVpp for analogue parts) First prototype –VICOR bricks used with VI-RAM filters –Ripple measured in Barcelona ~2Vpp

2. 12/2/2001Ivan Hruska & Georges Blanchot2 LV power supply for TILECAL October 2000 –Ripple measured at CERN 800mVpp ( scope BW 500MHz –Experiments with the best configuration on 5V level –After some changes ~80mVpp ( 20mVpp background ) –Detailed description in “Summary of experiments with LV prototype”

3. 12/2/2001Ivan Hruska & Georges Blanchot3 LV power supply for TILECAL October / November / December 2000 –New design done at Prague according to summary results and new mechanical requests –Ripple measured ~70mVpp for 5V level sensitive to output coil parameters –But 250mVpp on 15V output !

4. 12/2/2001Ivan Hruska & Georges Blanchot4 LV power supply for TILECAL Conclusion –New design improved the ripple value 10x –Ripple value is sufficient for 5V level digital –For 15V level and 5V analog is not sufficient –To go below 3mVpp is probably impossible with VICOR bricks we used