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Power Review: Calorimeters D. Gascon for the LHCb calo group Universitat de Barcelona Institut de Ciències del Cosmos ICC-UB LHCb - Electronics Upgrade Meeting – 11th October 2012 – CERN I. Introduction • The upgrade concerns the front-end electronics only Want to keep unchanged the rest of the electronics Do not change the corresponding power supplies • HV for the CW • HCAL Calibration system with Cs source • The constraints for the front-end electronics Purpose is to keep unchanged as many systems as possible The front-end boards have to be re-designed • Used linear regulators → availability for the upgrade is doubtful • DC-DC convertors being designed at CERN could be a replacement – http://project-dcdc.web.cern.ch/project-DCDC • I will discuss only the DC-DC convertor solution Discussions (G. Blanchot) indicate Magnetic field should be ok Radiation is not a problem either (for AMIS chip family) Noise → this is being tested: preliminary results OK! 2 I. Introduction • DCDC converters developped by CERN group Power distribution with DC-DC converters Vin Buck Converter High side Specifications: Vin<=10V Control Circuit Vout Phase Cout Vout=1.2-3.3V Iout<=3A frequency=1-3 MHz Constrains: Low side DC/DC ASIC magnetic (2T-4T) fields gnd radiation (TID>100Mrd, fluence > 2 1015 p/cm² ions with LET<40MeV·cm²/mg) 2 S. Michelis, Twepp 2012, Oxford 3 II. Powering scheme • To reduce the cost, we would like to use the present Maraton (Wiener) power supplies to power the DC-DC convertors • Wiener designed several types of modules for the Maraton PS Most of them have an output voltage larger or equal to 8V Our modules are limited to 7V ! • Tested a spare Maraton on the PH-ESE test bench (V. Bobillier) – 7V max at max power • DC-DC nominal Vin is 10 V, although usually tested 6 to 12 V Need to check carefully for final AMIS chip and required Vo & Iload ! Assume that DCDC can deliver 3A in any of the combinations 4 III. Powering requirements: ECAL/HCAL FEB • Analog Shapers ASIC design → Vo = 3.3 V Iload=1.6 A A Vref=1.65 V (160 mA) is also needed – Low power: DCDC not needed – Generated by ASIC or using ADC Vref + OpAmp COTS design → Vo= +/- 3V Iload= 3.2 A • Negative DCDC converter recently available (With positive input voltage) • We will test also single supply scheme (+ 6V) • ADCs Analog Vo = 3.3 V Iload=1.8 A Digital Vo = 3.3 V Iload=0.16 A • Digital part: PGAs Core → Vo = 1.5 V Iload=6 A IO → Vo = 2.5 Iload=2 A IO → Vo = 3.3 Iload< 1 A 5 III. Powering requirements: ECAL/HCAL FEB • Optical link (many assumptions on conssumption) 4 x GBT → Vo = 1.5 V Iload<4 A 4 x GBLD → Vo = 2.5 V Iload<1 A 4 x GBT-TIA → Vo = 2.5 V and 1.5 V Iload<1 A (both) • GBT-SCA CORE: → Vo = 1.2 V Iload< 0.1A) IO → Vo = 2.5 V Iload< 0.1A) • SLVDS to LVDS translators? 1.5 and 2.5 V • +5? V or -5? V → to be confirmed (NIM translators, etc...) ? Studying if possible to power at +3.3 V / -3.3 V (or remove) 6 III. Powering requirements: ECAL/HCAL FEB • Preliminary table (ASIC shaper) Many uncertainties Assume DCDC can deliver up to 3 A Voltage [V] Iload [A] Shared by DC-DC 3.3 Analog Shaper 1.6 ASICs 1 3.3 Analog ADC 1.8 Only ADC 1 3.3 Digital 1.16 ADC, PGA IO 1 2.5 Digital 5.1 PGA IO, GBT-SCA IO 2 1.5 Digital 12 GBT&Co, PGA Core 4 1.2 Digital 0.1 GBT-SCA Only one… 1 -3.3 V 0.1 NIM 1 • That means 10 positive and 1 negative DCDC modules • DC-DC input current: about 10.1 A For a 7 V input and with DCDC efficiency > 0.65 • Crate with 16 FEBs + 1 CB: 7 V requires < 170 A (4 Maraton modules) Assume CB requires only digital part (7.6 A) 7 III. Powering requirements: ECAL/HCAL FEB • Preliminary table (COTS shaper) Many uncertainties Assume DCDC can deliver up to 3 A Voltage [V] Iload [A] Shared by DC-DC 3 Shaper 3.2 COTS 2 3.3 Analog ADC 1.8 Only ADC 1 3.3 Digital 1.16 ADC, PGA IO 1 2.5 Digital 5.1 PGA IO, GBT-SCA IO 2 1.5 Digital 12 GBT&Co, PGA Core 4 1.2 Digital 0.1 GBT-SCA Only one… 1 -3 V 3.3 COTS, NIM 2 • That means 11 positive and 2 negative DCDC modules per FEB • DC-DC input current: about 13.22 A For a 7 V input and with DCDC efficiency > 0.65 • Crate with 16 FEBs + 1 CB: 7 V requires < 219 A (5 Maraton modules) Assume CB requires only digital part (7.6 A) 8 III. Powering requirements: other boards • Control board (new board) Blocks shared with FEB: Optical link, PGAs, GBT-SCA, etc.. We assume that same power configuration as for FEB works • Validation board Same as currently used (PGAs are reprogrammed) Need to keep Maraton settings: • Only using 3.3 V • Must be compatible with settings for DCDCs in FEB (7V) • LEDTSB board (LED control & interface to TFC) Same as currently used: same concern as validation • ~1A at +5 V, ~2A at +3.3 V and ~0.1 A at -5 V. But probably this can be reallocated in PS/SPD crates • If PS/SPD not in the upgrade which looks quite probable • Re-cabling needed ! 9 IV. Maraton configuration • Present PS configuration: +5 (Analog) / 100 A (2 modules) -5 (Analog) / 50 A (1 module) +3.3 (Digital) / 100 A (2 modules) +5 (Digital) / 50 A (1 module) • If 4 modules are required for 7V (DCDCs) : +5 (Analog) / 100 A (2 modules) to + 7 V -5 (Analog) / 50 A (1 module) to + 7 V +3.3 (Digital) / 100 A (2 modules) keep for Validation Board +5 (Digital) / 50 A (1 module) to + 7 V 10 IV. Maraton configuration • If 5 modules are required for 7V (DCDCs): +5 (Analog) / 100 A (2 modules) to + 7 V -5 (Analog) / 50 A (1 module) to + 3.3 V for Validation Board • Rework in validation would be required +3.3 (Digital) / 100 A (2 modules) to + 7 V +5 (Digital) / 50 A (1 module) to + 7 V • Power our system only partially with DC-DC convertors ? Actually our ADC are directly powered by the Maraton (no regulator) • Works well Keep the present Maraton: 6 modules But change the configuration in order to power • Partly our electronics directly • Partly the electronics through the DCDC convertors • Anyhow many assumptions and uncertainties are made !!! 11 VI. Requirements and assumptions • Requirements: To be able to operate the DC-DC converters at Vin ≤ 7V To be able to obtain Vo from 1.2 to 3.3 V with this input voltage About 250 boards (FEB + CB): • About 3000 positive DCDCs • About 500 negative DCDCs • Assumptions: Output current: up to 3 A Power efficiency > 0.65 12