Transcript Slide 1
Threshold Shift vs Gate Oxide Thickness Poly- Si Gate e-- SiO2 ++ ++ ++ ++ ++ ++ + + + + + + Si + + + + + + e- Tunneling Region Hole removal process by tunneling in thin-oxide MOS Structures Dosage = 150 Krads Sachs et. al. IEEE Trans. Nuclear Science NS-31, 1249 (1984) Book. Timothy R Oldham “Ionizing Radiation Effects in MOS Oxides” 1999 World Scientific 1 Company Oxide Thickness nm Device IHP A XYSemi XYSemi Dose before Damage seen Observation Damage Mode ASIC custom 5 53 Mrad slight damage FET 2 amps 7 52 Mrad Minimal damage XP5062 12.3 Loss of output voltage regulation 44 krad TI TPS54620 20 23 krad abrupt failure Intersil ISL 8502 unknown 40.6 krad Increasing input current IR IR3822 unknown 139 krads Increasing input current IR IR3841 9 & 25 13 krads Loss of output voltage regulation ST ST1510 unknown 125 krad Loss of output voltage regulation Enpirion EN5365 5 85 krad Increasing input current, Enpirion EN5382 5 111 krads Loss of output voltage regulation Enpirion EN5360 #2 5 100 Mrads Minimal damage Enpirion EN5360 #3 5 48 Mrads Minimal damage 2 Buck Regulator Efficiency after 100 Mrad dosage 80 Power Efficiency % 75 After Exposure 70 65 Before Exposure 60 55 Enpirion EN5360 With Integrated Inductor 50 45 40 0 1 2 3 4 5 6 Output Current Amps Found out at Power Technology conference 0.25 µm Lithography Irradiated Stopped on St. Valentines Day 2007 We reported @ TWEPP 2008 - IHP was foundry for EN5360 3 Twepp Nagos 4 XYSemi XP2201#1 Efficiency(%) 72 71 XYSemi XP2201#1 70 69 0 10 20 30 40 Dose(krad) LM2864 Efficiency(%) 80 78 76 74 LM2864 72 70 0 1000 2000 3000 4000 Dose(krad) 5 6 Is there a Commercial product available ? Yes = It is the EN5360 Satellite folks are using it now sLHC Levels – 100 Mrads Use for voltage ratio = 4 Work at Super LHC levels for Tracker 5.5 V in > 1.3 out Enpirion is still supplying these to a very large customer IHP foundry will make it for many years. Can purchase in Die form for use with Air coil For Purchasing EN5360: Steve Robb (908) 894 -6083 [email protected] Tom Howell (908) 894-6029 [email protected] 7 DC-DC Converter Voltage ratio = 8/10 Load: Rated Current or maximum without cooling ~ 1 amp Setup for 4 EVAL Boards Measure Bias Current with Load disconnected Power Supply V out > 5 – 20 Volts 4 Wire Current shunt ~ 0.5 Amps . VInput GND 5.5 V max to prevent damage. V Output Monitor 2 wire Differential Twisted Pair Preferred V Input Monitor. 2 Wire Differential Agilent 34970A & Multiplexer 33901A to Monitor I & V Buck Regulator Eval Board Size = 3 inch x 3.5 inch Twisted Pair Preferred Solder all wires ???? V Output Monitor 2 wire Differential 4 Wire Current shunt 1 to 5 Amps . GND V Output = 1.5 V . V Output Monitor 2 wire Differential Load Resistor = 0.3 to 1.5 Ώ Switch on/off Line Drop ~ 0.25 volts @ 6 amps in each Leg ??? Banana Jacks / Solder Wires Satish Dhawan, Yale University April 21. 2008 DC-DC Regulator Setup for Radiation Exposure 8