MDT FE Power Consumption M. Fras, 06 June 2019 ASD Power Depending - - PowerPoint PPT Presentation

MDT FE Power Consumption

• M. Fras, 06 June 2019

ASD Power Depending on Voltage

ASD Supply [V] ASD Current [mA] ASD Power [mW] 3.3 121 399 3.0 102 306 2.7 87 235

• No signal on ASD analog inputs.
• ASD default power-on configuration.
• All ASD LVDS outputs terminated with 100 W.

Mezzanine Card Power Consumption

LV Solution ASD Supply [V] ASD Current [mA] Analog Power [mW] Digital Power [mW] Total Power [mW] 3.3 V at mezzanine card, LDO for TDC 3.3 3 * 121 1,198 990 2,188 3.0 V at mezzanine card, LDO for TDC 3.0 3 * 102 918 900 1,818 4.0 V at mezz. card, LDO for ASD, LDO for TDC 3.3 3 * 121 1,452 1,200 2,652 4.0 V at mezz. card, LDO for ASD, LDO for TDC 3.0 3 * 102 1,224 1,200 2,424 5.0 V at mezz. card, LDO for ASD, LDO for TDC 3.0 3 * 102 1,530 1,500 3,030 5.5 V at mezzanine card, LDO for ASD, FEAST for TDC (70% efficiency) 3.0 3 * 102 1,683 514 2,197 5.5+ V at mezzanine card, FEAST for ASD, FEAST for TDC (70% efficiency) 3.0 3 * 102 1,311 514 1,851 5.5+ V at CSM MD, FEASTs on CSM MB for ASD and TDC (80% efficiency) 3.0 3 * 102 1,148 450 1,598 5.5+ V at CSM MD, FEAST on CSM MB for ASD (80%), FEAST on CSM MB + LDO for TDC 3.0 3 * 102 1,148 675 1,823

• Assuming 360 mW for TDC with TMR (300 mA at 1.2 V)
• Current MDT 316: 3 * 87 mA for ASD, 120 mA for AMT, 4.5 V at mezzanine card

=> 1,715 mW

Most Energy Efficient Approach: FEASTs on CSM MB

• 3 FEASTs for ASDs, 3 FEASTs for TDCs on the

CSM motherboard (6 mezz. cards each)

• Input voltage: 6..8 V
• Efficiency per FEAST (from FEASTMP datasheet):

– 86% (3 * 6 ASDs ≈ 1,900 mA @ 3.0 V) – 74% (6 TDCs ≈ 1,800 mA @ 1.2 V)

• Total power per mezzanine card:

1,591 mW (1,105 mW + 486 mW)

Safer Design with Good Energy Efficiency: FEASTs on CSM MB, LDO for TDC

• 3 FEASTs for ASDs, 3 FEASTs for TDCs on the

CSM motherboard (6 mezz. cards each)

• Input voltage: 6..8 V
• Efficiency per FEAST (from FEASTMP datasheet):

– 86% (3 * 6 ASDs ≈ 1,900 mA @ 3.0 V) – 80% (6 TDCs ≈ 1,800 mA @ 1.8 V, LDO for 1.2 V)

• Total power per mezzanine card:

1,780 mW (1,105 mW + 675 mW)

Conclusions

• Reducing the ASD supply from 3.3 V to 3.0 V

saves ≈ 30% power.

• Power efficiency needs system level approach.
• Most promising: 2 x 3 FEASTs for groups á 6

mezzanine cards on the CSM motherboard.

• BUT:

– Increased design-, test- and installation effort. – Potential delay in design and production schedule. – Effect on noise and analog performance must be studied.