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Power Working Group Summary

DC-DC Plug-in Module based on Rad Tol AMIS2 ASIC. Power Working Group Summary. Philippe Farthouat Magnus Hansen. Agenda POWER WG. S tatus and plans of the EMC CMS-tracker upgrade project Status of the switched capacitor DC-DC converters for the upgraded LHC trackers

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Power Working Group Summary

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  1. DC-DC Plug-in Modulebased on RadTol AMIS2 ASIC Power Working Group Summary Philippe Farthouat Magnus Hansen

  2. Agenda POWER WG • Status and plans of the EMC CMS-tracker upgrade project • Status of the switched capacitor DC-DC converters for the upgraded LHC trackers • DC-DC developments: future plans • DC-DC modules: gained experience, material budget improvements, grounding aspects • Integrated DC-DC converter in the FE-I4 • Coordinated developments for bulk supplies? First discussion

  3. Content • Mainly DC/DC • Switched Capacitor DC/DC converters • Step-down • ½ * input voltage • Step-up • 2 * input voltage • proposed in conjunction with serial power where you really prefer to regulate every node to the voltage required by the main consumer • Buck converters

  4. Talks • Cristina Esteban presented status and plans of the EMC CMS-tracker upgrade project

  5. Talks • Michal Bochenek presented status of switched capacitor DC/DC converters for tracker upgrades • Two step-up and two step-down converters on die • Tests on chips delivered in Feb2011 successful and Results are promising • radiation tolerance need to be improved • noise emission appear controllable by layout tricks and mounting options • Plans • increase capacity and improve the radiation tolerance • System tests: larger system tests with more than one converter on a feed line etc.

  6. Talks • Stefano Michelis presented more details about issues with Amis4 and plans for Amis5 • Integration • change pull-up voltage to 2.5V for power enable • change power good to open drain • Correct the Over Current protection • The amis4 chip is perfectly suitable to do system tests • over-current detection can be disabled • in case too much current is demanded the chip will fail gently: voltage drop and or over-heat 

  7. Talks • Stefano presented slides of George Blanchot • DC/DC converter modules with the AMIS2 chip are available in small quantity • AMIS4 modules soon available • material budget reduction is given attention and a factor 3 appear to be reachable • E.g. decreased PCB thickness, change capacitor type, etc • Discussion between CERN and Aachen will continue in order to explain the somewhat different results concerning shielding efficiency v.s. shield copper thickness

  8. Talks • Laura Gonella presented the switched capacitor regulator of the FE-I4 chip • Good results • External configuration appear critical for noise performance

  9. Switched Capacitor Converters • Note that these are “raw” converters • An LDO needed for precision voltage which cuts into the overall efficiency

  10. Conclusion • Very good progress • Reaching the moment when application specific tuning is required • Balance material, efficiency, reliability, cost, etc. • The detector layout and grounding need to be re-tuned in for noise performance when changing between serial power and DC/DC converter power making it very difficult to compare the performance of the two schemes. • No big surprise…

  11. Conclusion • Competitive collaboration is fruitful • E.g. Aachen and CERN developing DC/DC modules, EMC shields, etc. is likely to yield better working detectors • Ample time for large scale power system test before module production is highly desirable • Philippe Farthouat initiated a discussion for common development of bulk supplies, discussion to be resumed during the next WG meeting in the spring 2012.

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