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DEPFET power supply • Design summary • Status of the development & production - test run with S3a and S3b prototype - performance tests • To do list for production & development - ongoing production J. Schneider / 05.05.2009 / DEPFET workshop at Ringberg castle DEPFET power supply Design summary: DEPFET Power supply for lab measurements & TB runs ! • • • • • • 20 individual supply channel high voltage supply module voltage and current measurement remote control via USB storage of all supply settings output card defines purpose two prototypes are available - one for the S3a system - one for the S3b system (CERN - DEPFET TB at SPS - 2008) DEPFET power supply Channel configurations: 0 to +25 V 0 to -25 V +/-15 V @ @ @ 0 - 20 mA 0 - 20 mA 0 - 20 mA source/sink source/sink source/sink 0 to +25 V 0 to -25 V 0 to +25 V 0 to -25 V @ @ @ @ 0 - 300 mA 0 - 300 mA 0 - 300 mA 0 - 300 mA source sink sink source 0 to +10 V @ 0 - 800 mA source • • • • channel configuration is independent of the others even on the same module channels on same card share same GND channels on different cards are insulated from each other total output current of one quad supply module is limited to 300mA / 800mA OpAmp output stage (low current) Darlington output stage (high current) DEPFET power supply Channel configurations (principle): DAC + Uout - OpAmp output stage (low current) Uout DAC + - Darlington output stage (high current) DEPFET power supply Test run with S3a-System: Noise Distribution: mean = 12,17 ; = 0,5 Common Mode: = 16,3 (Contribution from Simone Esch, Bonn) DEPFET power supply Test run with S3b-System: Noise Distribution: mean = ~14,5 Common Mode: = ~16,8 (Contribution from Sergey Furletov, Bonn) DEPFET power supply Resistive load response test: Channel config: OpAmp output Channel config: Darlington output [V] [V] [mA] - linear behavior till the OpAmp output protection clamps the voltage -> no regulation instability [A] - linear behavior - slope due to the resistive component of the conducting traces, connectors and cables to the measurement equipment -> no regulation instability DEPFET power supply Capacitive load response test: - There is a need to do this test to see if regulation is stable -> we expect several capacitive loads on the hybrids -> The test with the DEPFET hybrids showed that the regulation is stable! but we do not know so far what is the safety margin DEPFET power supply Load transient response for darlington output (high current): 35mA transient (positive) -> no regulation instability 35mA transient (negative) -> no regulation instability DEPFET power supply Noise measurement for darlington output (high current): Conditions: • 50 Ohm load • 50 cm coaxial cable • frequency band 160Hz – 58 MHz @ -3dB Result: -> max. 1,3mV RMS noise measured over hole frequency band DEPFET power supply Status of the development & production progress: time scale Sep. 2008 Development steps and work packages: available prototype for S3a-System (CURO2/Switcher2) linearity / dynamic range / control deviation load tests (resistive, capacitive and dynamic) firmware debugging for the USB microcontroller performance tests S3a-prototype: stable operation with module adapting to the S3b-system - redesign hardware now S3b-prototype: stable operation with module writing the application software Summer 2009 S3b-prototype: final tests S3b series production finally 10 power supplies available for TB & lab measurements DEPFET power supply To do list for production & development : • • • • µC firmware needs still some extensions HV module is tested but not fully debugged capacitive load test -> more details some development in the control software for TestBeam issues • series production of nine further supplies is ongoing -> backplanes -> quad cards -> HV modules -> output cards -> final assembly Hardware available: (for nine further P.S.) - cases - controller cards DEPFET power supply ... We are in time ... for TB 2009 … ... Questions so far? ... … many thanks … DEPFET power supply Block diagram of the multi channel power supply: Analog voltage lines Digital control bus, 24 V supply backplane Display & USB Interface switches & Microcontroller • Single channel supply module HV module Relay card D-Sub connector to DEPFET module 21 supply voltages each module has a floating ground Controller – – • Digital isolators 5 quad supply modules + 1 HV module – – • Digital Digital isolators Digital isolators Digital Quad channel isolators Digital Quad channel isolators supply module Quad channel isolators supply module Quad channel supply module Quad channel supply module supply module non volatile storage of voltage settings USB interface (local control optional) Relay card – controlled switching of the voltage outputs Multi channel power supply in 15” case DEPFET power supply Quad supply module: isolated power supply & filter EEPROM SPI ADC DA DAC DAC C DAC . current sense current sense current sense programmable voltage source current sense voltage sense Front panel Bus connector 24 V output voltages • • • four independent programmable output voltages with common floating ground voltage range: -25V … +25V output current : – – • • • +/- 15 mA (OPA output) max. 300 mA (power transistor, config. current limit & pol.) voltage & current read back EEPROM stores/restores voltage settings optional front panel for local control Quad supply module card