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SPP/FIELDS Low Noise Power Supply Preliminary Design Review

SPP/FIELDS Low Noise Power Supply Preliminary Design Review. Steve Monson University of Minnesota monson@waves.space.umn.edu. 3D View of Main Electronics Package. SPP FIELDS Instrument Block Diagram. LNPS Requirements. O perate from 22 to 35 VDC

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SPP/FIELDS Low Noise Power Supply Preliminary Design Review

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  1. SPP/FIELDSLow Noise Power SupplyPreliminary Design Review Steve Monson University of Minnesota monson@waves.space.umn.edu

  2. 3D View of Main Electronics Package

  3. SPP FIELDS Instrument Block Diagram

  4. LNPS Requirements • Operate from 22 to 35 VDC • Operate over the range of -25 C to +65 C base plate temperature • Must sync at 150 kHz but operate nominally without sync • Provide ten DC voltage supplies • 1.8V, 3.3V, 4V, 5V, +/- 6V, +/- 12V, +/- 100V • +/-100V supply to be delayed by 100ms from 5V supply (AEB) • Total secondary power to be approx. 9w for LNPS1 and 5w for LNPS2 • Monitor Housekeeping (10 voltages, LNPS temp and one SCM temp) • Provide sense circuit and control for SCM heater • Provide pass through of some additional lines • Primary heater power for MAG and Preamps • Temperature feedback for MAG, SCM and Preamps

  5. Comparison • STEREO/WAVES SPP/FIELDS 15 watts primary LNPS1 11w (25 C) 15w (55 C) LNPS2 7w (25 C) 9w (55 C) 100 kHz 150 kHz LTC1149 switching regulator MSKennedy 5055RH (plastic) (LT3845A rad hard dice) HS1825ARH pulse width modulator same 25 C 55 C

  6. LNPS Block Diagram

  7. LNPS1 Customers DCB RFS DFB AEB SCM MAG (mA) (mA) (mA) (mA) (mA) (mA) • 1.8V 500 728 • 3.3V 450 428 1 • 4V 170 • 5V 150 • +6V 41 24 12 • -6V 41 19 12 • +12V 4 11 12 52 • -12V 4 11 12 28 • +100V .5 • -100V .5 Total 14.5 watts primary at 55 degrees C

  8. LNPS2 Customers TDS AEB2 MAG (mA) (mA) (mA) • 1.8V 500 • 3.3V 450 1 • 5V 111 • +6V 6012 • -6V 60 12 • +12V 7 52 • -12V 7 28 • +100V .3 • -100V .3 Total 8.3 watts primary at 55 degrees C

  9. Peer Review Action Items

  10. SYNC at 150 kHz • Pre-Regulator and PWMs free run at 135kHz • 600 kHz square wave clock • generated by DCB for LNPS1 • generated by TDS for LNPS2 • Binary counter makes 150kHz for Pre-Regulator and 300kHz for first PWM • Second and third PWMs are slaved from the first • Pre-regulator and 3 PWMs alloperate in sync from 16V to 40V input. • In the event of sync failure, all 4 free run at ~135kHz whether sync stops up, stops down, or is removed completely.

  11. 12V Pre-Regulator • 95% efficient at 11 watts • 1 watt change causes only 1 mV change in output

  12. Turn On Delay • Flight instrument will have AEB +/-100V delayed from +5V by 100ms • Top: 12V Pre-Regulator 10V/div • Middle: 3.3V 2V/div • Comes from first PWM • Bottom: 4V 2V/div • Comes from 2nd PWM • Time: 25 ms/div

  13. Tested a breadboard with the Pre-regulator and two PWMs Turned on instrument in 1/3 volt increments from 0 to 28V No evidence of a high current mode where two FETS were on at the same time Low Voltage Turn 0n

  14. Inrush current SPP Requirements STEREO/WAVES 1 amp / div 1 ms/ div • SPP has same specs as STEREO • SPP/FIELDS will be very similarto STEREO/WAVES which was well within spec • 100ms delay of one PWM will lower first spike and make a second smaller peak at 100ms

  15. Conclusion • All components have been bread-boarded and tested • Issues • LNPS operating temperatures are high (55C) • LNPS1 parts layout is crowded • Both issues are being resolved • Next • LNPS1 brass board layout is in the works – ETU form and function • LNPS1 BB TV is planned • ETU final designs • Preliminary LNPS design meets requirements • LNPS is ready to proceed with ETU development

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