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GLAST Large Area Telescope: Electronics, Data Acquisition & Flight Software TEM Power Supply Part 2 Gunther Haller

Gamma-ray Large Area Space Telescope. GLAST Large Area Telescope: Electronics, Data Acquisition & Flight Software TEM Power Supply Part 2 Gunther Haller Stanford Linear Accelerator Center Manager, Electronics, DAQ & FSW LAT Chief Electronics Engineer haller@slac.stanford.edu

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GLAST Large Area Telescope: Electronics, Data Acquisition & Flight Software TEM Power Supply Part 2 Gunther Haller

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  1. Gamma-ray Large Area Space Telescope GLAST Large Area Telescope: Electronics, Data Acquisition & Flight Software TEM Power Supply Part 2 Gunther Haller Stanford Linear Accelerator Center Manager, Electronics, DAQ & FSW LAT Chief Electronics Engineer haller@slac.stanford.edu (650) 926-4257

  2. Team • High-Voltage • Dieter Freytag (SLAC) • Original assist by Art Ruitberg (GSFC) • Low Voltage • Dave Nelson (SLAC) • Assist by Dieter Freytag, Joszef Ludvig (SLAC) • Combined Board • Dave Nelson (SLAC) • Mark Freytag, Dieter Freytag (SLAC) • Layout • HV section: Cathy (SLAC) • Combined Board: Tung Phan (SLAC) • Assembly/Parts • Lupe Salgado (SLAC) • Mechanical/Thermal • Dave Nelson, Jobe Noriel, Dave Tarkington (SLAC)

  3. Top-Level Blocks

  4. Filter Section • Uses standard MIL-461 filter for flight. Board can also be loaded with commercial filter for EGSE versions (to other sub-systems) • See Schematic “Filter” block 28V from PDU Filter 28-V filtered

  5. TEM DAQ Section • Uses delay circuit to turn-on 3.3V to ACTEL FPGA’s on TEM DAQ after 2.5V core voltage (see ACTEL alert) • See Schematic “DAQ” block 28V filtered Delay 3.3V Converter 3.3 V TEM DAQ 2.5V Converter 2.5 V TEM DAQ

  6. CAL Section 28V switched 28V filtered 3.3 V CAL analog • HV starts at 30V • HV and LV are switched on/off together (no independent HV switch) • PC-board designed so linear regulator can be added in case noise is not low enough • Either International Rectifier low-drop linear regulator • Regulator with single NPN • Baseline is without linear regulator because • Higher efficiency • Omnirel max output voltage is 3.2V 3.3V Converter Filter Switch CAL enable 3.3 V CAL digital Filter 3.3V Converter 30V-100V HV Converter Cal set voltage (0-2V)

  7. TKR Section 28V switched • HV starts at 30V • HV and LV are switched on/off together (no independent HV switch) • PC-board designed so linear regulator can be added in case noise is not low enough • Either International Rectifier low-drop linear regulator • Regulator with single NPN • Baseline is without linear regulator because • Higher efficiency • Omnirel min input voltage is 2.9V (high for 1.5V output, loose 50% of power in linear regulator) 28V filtered 1.5 V-A TKR analog 1.5V Converter Filter Switch 1.5 V-B TKR analog TKR enable 1.5V Converter Filter 2.5 V-A TKR analog 2.5V Converter Filter 2.5 V-A TKR dig Filter 2.5 V-B TKR analog 2.5V Converter Filter 2.5 V-B TKR dig Filter HV Converter TKR set voltage (0-2V) 30V-150V

  8. Typical Low-Voltage Operating Circuit Vref R For 1.5V output • For 3.3V and 2.5V: set by resistor ratio according to data-sheet • For 1.5V output: • Can’t just select resistor divider since internal reference is 2.2V • Solution: sum in current (resistor from external zener diode) at FB node to offset feed-back voltage

  9. High-Voltage DC/DC Converter (Simplified) • For details, see schematic

  10. TEM-PS Board Connector to TEM Maxim High-Voltage

  11. High-Voltage Supplies • SLAC (Dieter) • Circuit Design & Simulations (PSPICE) • PC board circuit debug/circuit modifications • Noise, stability measurements (see example plot) • GSFC (Art) • Got loaded board from SLAC • Phase margin measurements (see plot) • Consultation

  12. Signal at Coil and at Switching Transistor • Courtesy of Dieter Freytag

  13. High Voltage Noise • Courtesy of Dieter Freytag, with RC Filter at output, RMS ~11mV, dominated by 60 Hz-line (need to be remeasured in TPS enclosure)

  14. High-Voltage Amplitude/Phase • Courtesy of Art Ruitberg

  15. Low-Voltage Supplies • Mostly Dave Nelson (SLAC)

  16. TKR 1.5V when TKR is turned on • 28V powered • TKR 1.5V supply output when TKR supplies are turned-on via TEM DAQ enable signal

  17. CAL 3.3V when 28V is turned on • CAL 3.3V analog output when 28V supply is turned on (CAL already enabled)

  18. Step into Feedback • TKR 1.5V response when 200mW step is applied to feed-back • Damped

  19. Step into feedback with 50nF • TKR 1.5V response when 200mW step is applied to feed-back • Better response

  20. Amplitude/Phase of TKR 1.5V

  21. Amplitude/Phase of CAL 3.3Vanalog • 54 degree phase margin

  22. CAL 3.3V analog Noise Spectrum • * Plot is baseline subtracted • Very good performance

  23. TEM DAQ 3.3V Noise Spectrum • * Plot is baseline subtracted • TEM digital has no LC filter on TEM PS • Still very good performance

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