15. CBM Collaboration Meeting, GSI, Darmstadt, April 12–16, 2010

Status of Front End Electronics

N-XYTER PCBs &

Power Supply

Volker Kleipa,GSI Darmstadt

15. CBM Collaboration Meeting, GSI, Darmstadt, April 12–16, 2010

Topics

NYXTER FEB_D N-XYTER FEB_D PCB FEB_B,C,D N-XYTER cooling

NYXTER Demonstrator

DC power supplies test in high magnetic fields Multiphase DC/DC converter step down Piezo 2KV generator

Status

15. CBM Collaboration Meeting, GSI, Darmstadt, April 12–16, 2010

N-XYTER FEB_D PCB

Changed/added in rel. to FEB_C:

Increased NXYTER bond pitch 0.3V drop LDOs used Separated supply regulators PT100 sensor out Alternative connector for

separated LVDs and common mode signals

Testpoints New power connector I2C and SPI spike filter

I2C reads now: Temperature Current Testchannels Slow, Fast

I2C RW: Serial EEprom for data storage

15. CBM Collaboration Meeting, GSI, Darmstadt, April 12–16, 2010

N-XYTER PCB Cooling Plate

Cooling Block for FEB_B, FEB_C and FEB_D

Design by Carmen Simons

15. CBM Collaboration Meeting, GSI, Darmstadt, April 12–16, 2010

N-XYTER Demonstrator

• Input pitch 100um • PCB size 65mm x 80mm

• Cooling of 14W power with bottom copper or Al plate

• ADC device on bottom side• Ext. power supply regulation

Open task:• Staggered NXYTER

bonds to one layer input fan• Data output connection

15. CBM Collaboration Meeting, GSI, Darmstadt, April 12–16, 2010

Multiphase DC/DC converter step down test

Target ist to develop power supply converters for high magnetic field environments.

The used test design is a 2 Phase DC/DC step down converter TI TPS4031EVM

Manufacturers spec.: Converter 12V to 3.3V, >82% eff. 30mVpp ripple @40A output 190kHz each phase

Test preparation: 800nH coils are replaced

by air coils Output set to 3.3V Load ~0.5 Ohm 1.6 Tesla environment

15. CBM Collaboration Meeting, GSI, Darmstadt, April 12–16, 2010

DC/DC Converter Results

Measured during test: Load 5.5A @ 2.4V out(2x5m cable to load) 0.6Vpp ripple / 380kHz 61% efficiency

• Ripple reduction by increasing phase frequency EM reduction with toroid air coil design and copper shield Spread spectrum clocking?

15. CBM Collaboration Meeting, GSI, Darmstadt, April 12–16, 2010

Piezo 2KV generator test

Target was to test a piezo-device in a high magnetic field environment.Design used is a PZT high voltage power supply PPT04P2020XB1/ MMech

Manufacturers spec.: Max. 4W output Max. 2mA output >70% eff. Max 0.1% Vpp ripple Converter in 8-14V Analog adjustable 0..2KV

Test preparation: A 30uH shielded coil was replaced by an air coil Output set to 1KV 1M Ohm load 1.6 Tesla environment

15. CBM Collaboration Meeting, GSI, Darmstadt, April 12–16, 2010

2KV Piezogenerator test results

Measured during test: 0.6% Vpp ripple @ 1KV / 1W output 66% efficiency

Ripple reduction by:Air coil design

An attenuation of noise spikes in magnetic field was detected.

Output measured with 100:1 prescaler

15. CBM Collaboration Meeting, GSI, Darmstadt, April 12–16, 2010

Status

FEB-D PCB - Assembling ongoing

• Demonstrator - Finish of prototype when FEB-D manufacturing is fixed

• Power supply tests - Switching converters with more phases and optimized air coils - Step down piezoelectric-converters - Beam-Test with piezo-device

15. CBM Collaboration Meeting, GSI, Darmstadt, April 12–16, 2010

Thanksfor your attention