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