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VW80808Part 2
Agenda
• What is the VW80808
• Changes to previous version
• Usage of Tantal and Polymer
• MLCC ⎼ Component requirement
⎼ Application requirement
⎼ Flexible termination
⎼ ESD
⎼ Terminal 30 application
3
VW standard
• Component requirements
• Qualification requirements
• Application requirements
• We are NOT allowed to handout a digital or paper copy of thespecification
• VW supplier should always use the latest online version
• VW support the marketing approach of VW80808 - it‘s a win-win situation( similar to an oil specification)
VW 80808 changes
6
Old New
Tantal Tantal not allowed Tantal 2,5W rule Not on terminal 30
Polymer Not mentioned Polymer 5W rule Not on terminal 30
MLCC Case < 1210 0805 < Casesize < 1210
MLCC battery Vr = 100V
Flexterm THB 2xVr 85°C/85%rH 1000h
THB 1xVr 85°C /85%rH 1000h or 130°C/85%rH 96h or 110°C/85%rH 264h
High voltage Not mentioned Floating Electrode 1000Vr + KPS Floating Electrode 1000Vr + FlexTerm
MLCC -Y Not mentioned Two capacitor in a row Vr >= 2x Vbatt
Polymer
Tantal/Polymer capacitors – Section 9.2.2
• Tantal and Polymer capacitors are not allowed between hot terminals and 31 (GND)(Terminal 30, 30G, 30C, 40, 15, 50, 87 etc)
• Tantal capacitors with a MnO2 can be useda) The power in the current path is limited to 2.5W
b) The inrush current is lower 10A
• Tantal capacitors with a Polymer cathode can be useda) The power in the current path is limited to 5W
b) The inrush current is lower 20A
• The robustness over lifetime has to be proofed
Tantalum or Polymer
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Polymer Capacitors
10A
Derating guidelines
• Derating applies above 105°C
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Polymer 5W Rule
12
• 5W = 5V x 1A
• For USB 2.0 powerlines
• 5W = 1V * 5A
• GPU / ICAR - SMPS on secondaryside
A
The robustness over lifetime has to be proofed
13
UltraExtended Mission ProfileCalculations & Validation – T599D157M006ATE025 – 3,3V DC/DC Output
FIT TOTAL (Project Mission Profile) - 0,6
MISSION PROFILE (NEW)Temperature (ºC) % / Time 8000 l base Temperature PT Voltage PV Capacitance PC Quality PQ Series Resistance PSR FIT FIT x %Time
-40 3% 3942 0,00005 0,961 1,001 3,166 0,707 3,300 0,355345 0,010661
-20 3% 3942 0,00005 0,961 1,001 3,166 0,707 3,300 0,355345 0,010661
20 10% 13140 0,00005 0,961 1,001 3,166 0,707 3,300 0,355345 0,035536
40 43% 55845 0,00005 1,323 1,001 3,166 0,707 3,300 0,489013 0,207837
60 32% 42701 0,00005 1,847 1,001 3,166 0,707 3,300 0,682864 0,221917
75 4% 5256 0,00005 2,314 1,001 3,166 0,707 3,300 0,855374 0,034216
85 1% 657 0,00005 2,661 1,001 3,166 0,707 3,300 0,983596 0,004918
90 4% 5256 0,00005 2,845 1,001 3,166 0,707 3,300 1,051704 0,042069
105 1% 657 0,00005 3,441 1,001 3,166 0,707 3,300 1,272064 0,006361
1 131396 FIT Total 0,5741745643
assume < 0,1V/Ohm 1FIT = 1E-9/h
S= Uapp/Ur
0,523
Basic FR 0,5%/1000h (150ºC/0,67Ur) = 5000FIT
Application Voltage - 3,3V
Temperatare < 23ºC - use RT calculation
Environmental, Ground = 1
Failure Rate Conversion Factor - MIL-HDBK-217k Note 2 (Polymer Changes)
• Proof of Robustness validation
C
T597 - MLCC Dropin Replacement
15
P-Case 0805 = 2012 22uF 6.3V S-Case 1206 = 3216 47uF 6.3V
Polymer Technology Calculations & Validation – T599D157M006ATE025 – 3,3V DC/DC Output
New – Ultra Extended Mission Profile
T599, 6,3V product fullfills
>10Yrs 105ºC at 3,3V
MISSION PROFILE (NEW)Temperature (ºC) % / Time 8000 l base Temperature PT Voltage PV Capacitance PC Quality PQ Series Resistance PSR FIT FIT x %Time
-40 3% 3942 0,00005 0,961 1,001 3,166 0,707 3,300 0,355345 0,010661
-20 3% 3942 0,00005 0,961 1,001 3,166 0,707 3,300 0,355345 0,010661
20 10% 13140 0,00005 0,961 1,001 3,166 0,707 3,300 0,355345 0,035536
40 43% 55845 0,00005 1,323 1,001 3,166 0,707 3,300 0,489013 0,207837
60 32% 42701 0,00005 1,847 1,001 3,166 0,707 3,300 0,682864 0,221917
75 4% 5256 0,00005 2,314 1,001 3,166 0,707 3,300 0,855374 0,034216
85 1% 657 0,00005 2,661 1,001 3,166 0,707 3,300 0,983596 0,004918
90 4% 5256 0,00005 2,845 1,001 3,166 0,707 3,300 1,051704 0,042069
105 1% 657 0,00005 3,441 1,001 3,166 0,707 3,300 1,272064 0,006361
1 131396 FIT Total 0,5741745643
assume < 0,1V/Ohm 1FIT = 1E-9/h
S= Uapp/Ur
0,523
Basic FR 0,5%/1000h (150ºC/0,67Ur) = 5000FIT
Application Voltage - 3,3V
Temperatare < 23ºC - use RT calculation
Environmental, Ground = 1
Failure Rate Conversion Factor - MIL-HDBK-217k Note 2 (Polymer Changes)
Reliability
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MLCC
Component requirement
©KEMET Corporation. All Rights Reserv ed. 19
Possible Solutions for 10µF @ terminal 30
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• 100Vr for MLCC
• Safety MLCC mechanism : Floating electrode Openmode, flexterm and KPS
2x standard Open
mode
KPS 2x FlextermAcc. VW80808
Safety MLCC +
Varistor
Safety MLCC +
Surpressor
100V 100V 100V 50V 50V
10pcs 10pcs 5pcs 10pcs 1pcs + 1 pcs 1pcs + 1pcs
A
12V Batterie → Vr = 100V
• For Terminal 30 100Vr is mandatory
• can be < 100V if the voltage is clamped with TVS or Varistor (MOV)
• Tradeoff between⎼ some 100V MLCC with lower capacitance
⎼ Lower rated voltage but more cap plus cost of TVS diode
• Example : need 10uF⎼ A) 5x 1210/225/100V
⎼ B) 2x 1210/475/50V plus TVS
21All values in nF
Offering for 12V Batterie
22OM = Open mode FE = Floating electrode(MLSC)
Case size on hot terminals
• Minimum case size on terminal 30 is 0805
• Is an active errordetection (current) is implemented for power consumption greater than 2.5W and can disconnect the short , nofailsafe is necessary
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ESD and failsafe strategy
• Only 0603 case and bigger
• Minimum capacitance 10nF
• The product of V x C >= 2200 V * nF⎼ Example 1 : 100V * 22nF >= 2200VnF
⎼ Example 2 : 50V * 47nF >= 2200VnF
• If smaller capacitance values required a TVS in parallel is mandatory
• If parts are acc. EN61000-4-2 smaller cap values are permitted
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ESD Portfolio for VW
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Flexterm
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Flex termination
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Test Sequence Harsh enviroment
• Very harsh testing
• Very long testing ( more two thousand hours)
• 690ßIn the past no data were available
• In the latest version condition were mitigate
• Broader capacitance range available
Electrical Measurement ( C, DF, IR)
Bending test 5mm
Temperature , Humidity & Bias
Thermal cycles
Bending test 5mm
Electrical Measurement ( C, DF, IR)
Start 100pcs
End
Mounting PCB
Electrical Measurement ( C, DF, IR)
Short THB(24h)
VW80808 - current versus proposed waterfall
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12V and 48V Bordnet
• Two MLCC inline but orthogonal ( 90° orientation )
• KPS ( metal bracket, Megacap, T-Bar)
• MLCC with a floating electrode (MLSC – Design ( Epcos brandname for FE)
• Openmode
• Flexible termination ( aka softtermination)
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Solutions for 10µF @ terminal 30
• 100Vr for MLCC
• Safety MLCC mechanism : Floating electrode Openmode, flexterm andKPS
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2x standard Open
mode
KPS 2x Flexterm Safety MLCC +
Varistor
Safety MLCC +
Surpressor
100V 100V 100V 50V 50V
10pcs 10pcs 5pcs 10pcs 1pcs + 1 pcs 1pcs + 1pcs
Terminal 30 - 1uF/100V Solutions
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Flex MITIGATION design
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High voltage application
• The rated voltage of a series circuit (also for floating electrode) MUST betwice rated voltage
• Minimum rated voltage for floating electrode⎼ 1000V for 400V system⎼ 2000V for 800V system
•
• 2nd safety mechanism either KPS or a flexible termination is required
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1210 / 1000V 1210 / 2000V 2220 / 1000V - KPS 2220 / 2000V - KPS
68nF 6.8nF 240nF 44nF
High voltage
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High voltage X and Y
• X – capacitor
⎼ Two flexterm MLCC in 90° orientation in series
⎼ One MLCC with floating electrode in KPS
• Y-capacitor
⎼ DC – application : HV_Plus to GND or HV_Minus to GND ⎼ AC – application : AC to chassis or Neutral to chassis
⎼ ONLY two capacitors 90° orientation in series allowed
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Wrap up
• Polymer
• Polymer officially approved on secondary side of the regulators (
Axel Schmidt
Field Application Engineer, Germany
Mobile: +49-172-8925284
Thank you!
