LINK BOARD PROJECT UPGRADE

Pigi Paolucci and Napoli group

Outline

LB CAD project LVDS suppressor studies LV regulator studies Open questions To be done

Link Board Upgrade Meeting - Dec 20102 Pigi Paolucci

LV Regulator LHC4913

Link Board Upgrade Meeting - Dec 2010Pigi Paolucci3

LB project schema

Link Board Upgrade Meeting - Dec 2010Pigi Paolucci4

Test schema LHC4913

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Vin = 5VVout = 3.3VIout = 1.4A (Load=2.3//2200uF); Ta = 27°C; Td = 91°C

Link Board Upgrade Meeting - Dec 20106 Pigi Paolucci

Temperature Tests

1 volt1 msec

2 msec

Vin

Vout

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Rumping up and down

Vin

Vout

Vin

Vout

Vin=5V; Vout=3.3V

Iout=2.6A (Load=1.2//2200uF); Ta=27°C; Td=135°C

Link Board Upgrade Meeting - Dec 20108 Pigi Paolucci

Temperature Tests

1 volt1 msec Vin

Vout

Link Board Upgrade Meeting - Dec 20109 Pigi Paolucci

Rumping up and down

Vin

Vout

Vin

Vout

Vin=5V; Vout=3.3V

Iout1=1.4A (Load=2.3//2200uF)

Iout2=2.6A (Load=1.2//2200uF)

Link Board Upgrade Meeting - Dec 201010 Pigi Paolucci

Different Loads

Vin

Vout

Vin=5V; Vout=3.3V

Iout1=1.4A (Load=2.3//2200uF)

Spike=5V / Vin=10V Spike su Vout > 10mV

Link Board Upgrade Meeting - Dec 201011 Pigi Paolucci

Vin

Vout

How does react to input spikes

Tmax (junction) = 125°C; Rcase (junction) = 2°C/W (datasheet)

Working caseVin = 5V; Vout = 3.3V; Iout = 1.5A Power to dissipate = (5V - 3.3V) * 1.5A = 2.55W; Tamb=25°C Rtot = /W = (125°C – 25°C)/2.55W = 39°C/W

Rheatsink = Rtot-Rjc = 37°C/W

Worst caseVin=6V; Vout=3V; Iout=3A Power to dissipate= (6V – 3V) * 3A = 9W; Tamb = 40°C Rtot = /W = (100°C - 40°C)/9W = 6.6°C/W

Rheatsink = Rtot-Rjc = 4.6°C/W

Link Board Upgrade Meeting - Dec 201012 Pigi Paolucci

Heat Dissipation

Test Conditions Vin=6V; Vout=3.3V; Iout=2.6A; Tamb=25°C

Temperature on the case: 155°C -:- 135°C

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Max temperature behaviour

Regulator Infrared scan

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Standard condition Worst case – before shutdown

Worst case – after shutdown

Costs

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needed spare PCB + mount + test components cost Total

Crates 12 2   €100,0 €100,0 €1.400,0

ControlBoard 24 4 €430,0 €362,0 €792,0 €22.176,0

Link Board Master 48 5 €200,0 €450,0 €650,0 €34.450,0

Link Board Slave 96 10 €200,0 €400,0 €600,0 €63.600,0

BackPlane 12 2 €337,0 €395,0 €732,0 €10.248,0

Frontplane 24 4 €99,0 €75,0 €174,0 €4.872,0

Mod APA450 24 4 €146,0 €385,0 €531,0 €14.868,0

Mech. 24 4 €37,5 €30,0 €67,5 €1.890,0

€153.504,0

Time schedule

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2011 2012

J F M A M J J A S O N D J F M A M J J A S O N D

LB prototype

LB test

CB prototype

CB test

Lbox

production

Test 904

Installation and commissioning in the 2013

Manpower and tasks

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Napoli is interested in the design of the “up-to-date” system P. Paolucci, S. Buontempo, N. Cavallo (sabbatical year in the 2011) Electronic Service: 6-7 months in the 2010 and 2011 Napoli is now (2010) designing the “up-to-date” LB system including:

LVDS suppressor, LV regulators. First design almost ready (80%). Cost estimation ready

LNF is looking at the test and commissioning of the system L.Benussi, L.Passamonti (Tech.), D.Pierluigi (Tech.) and Electronic

Service: 3-4 months in 2011 Warsaw is in charge for the test, commissioning and installation

of the system Warsaw is the only group having the full expertise of the link

board hardware and firmware system The participation of new groups at the LB project has been

strongly recommended by the CMS management

Manpower needed ?

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Prototypes test at CERN: 1 tech + 1 phys for 3 months (2011) + Warsaw Test at CERN (blg 904): 1 tech + 1 phys for 6 months (2012) + Warsaw Installation: 2 tech + 1 phys for 6 months (2013) + Warsaw Commissioning: 1 phys for 3-4 months (2013) + Warsaw

To be done

Document about the project, schedule, manpower and responsibilities:

Napoli, LNF and Warsaw ?: Napoli and LNF: production Warsaw, Napoli and LNF: prototype test at 904 Warsaw, LNF and Napoli: Production test and commissioning

New design: regulators + heat sink + what else ? LV board: new firmware + what else ? What about the spares ?

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Conclusion

Preliminary conclusions of the Electronic Service in Napoli:1. The present project is very good, complex and sophisticated;

congratulation to our Warsaw/Finland colleagues

2. Two “rad-hard” LV regulators per boards (LB/CB) are suggested – heat dissipation to be studied very carefully

3. Not clear if we really need a set of LVDS protections

4. Spartan III configuration could be double checked

New LB boxes and boards can be produced in Italy but only Warsaw experts can test and commissioning the full system – Napoli and LNF will be part of the business but not the main actors

INFN will discuss and decide about the project in Jan 2011

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