SL Corporation used ANSYS software to analyze electrostatic discharge (ESD) voltage and predict discharge path with an RLC model.

1. 1
SL Corporation Confidential.
The Contents may only be passed on, used or made known with our express permission. All rights reserved. © 2014 ANSYS, Inc. May 19, 2014
Case study of automotive ESD
SL corporation
Hongkeun Kim

2. 2
SL Corporation Confidential.
The Contents may only be passed on, used or made known with our express permission. All rights reserved. © 2014 ANSYS, Inc. May 19, 2014
Background
Circuit Design / Challenges
Measurements
Discharge Path Simulation
Summary
Outline

3. 3
SL Corporation Confidential.
The Contents may only be passed on, used or made known with our express permission. All rights reserved. © 2014 ANSYS, Inc. May 19, 2014
ESD(Electrostatic Discharge)
• System of ESD test
- Contact Discharge
- Non-contact(Air) Discharge
Background
Sharp point
Body of simulator
− Case 1. Voltage, Current characteristics when ESD source was excited

4. 4
SL Corporation Confidential.
The Contents may only be passed on, used or made known with our express permission. All rights reserved. © 2014 ANSYS, Inc. May 19, 2014
Modeling of ESD Gun
ESD Analysis
− INTERNATIONAL STANDARD
ISO10605
− Byoung-Su Seol, David Prommerenke
“A Circuit Model for ESD Performance
Analysis of Printed Circuit Boards
− For 150pF/330pF 330Ω and 5kV

5. 5
SL Corporation Confidential.
The Contents may only be passed on, used or made known with our express permission. All rights reserved. © 2014 ANSYS, Inc. May 19, 2014
Passive Modeling
ESD Analysis
− Model all passive components with impedance analyzer
− To create frequency dependent equivalent network for device
CQ1608X7R472K Capacitor Impedance
0.35nH 0.133Ω 4.7nF

6. 6
SL Corporation Confidential.
The Contents may only be passed on, used or made known with our express permission. All rights reserved. © 2014 ANSYS, Inc. May 19, 2014
PCB/Circuit Simulation
ESD Analysis
− End time: 150ns
Virtual
Load Port
PDS5100H
S3M
Connector

7. 7
SL Corporation Confidential.
The Contents may only be passed on, used or made known with our express permission. All rights reserved. © 2014 ANSYS, Inc. May 19, 2014
Voltage Level
ESD Analysis
− Simulation result of the voltage PDS5100H, S3M anode
: PDS5100H
: S3M
-91V
-444V
-102V

8. 8
SL Corporation Confidential.
The Contents may only be passed on, used or made known with our express permission. All rights reserved. © 2014 ANSYS, Inc. May 19, 2014
Voltage Level
ESD Analysis
- PDS5100H: There is no margin compared with VRRM - S3M: There is 556V margin compared with VRRM
Peak Repetitive Reverse Voltage(VRRM): 100V Peak Repetitive Reverse Voltage(VRRM): 1000V
Margin
= 556V

9. 9
SL Corporation Confidential.
The Contents may only be passed on, used or made known with our express permission. All rights reserved. © 2014 ANSYS, Inc. May 19, 2014
Current Level
ESD Analysis
− Simulation result of the current PDS5100H, S3M cathode
: PDS5100H
: S3M
-5V
-42A

10. 10
SL Corporation Confidential.
The Contents may only be passed on, used or made known with our express permission. All rights reserved. © 2014 ANSYS, Inc. May 19, 2014
2.5D PCB Simulation
ESD Analysis

11. 11
SL Corporation Confidential.
The Contents may only be passed on, used or made known with our express permission. All rights reserved. © 2014 ANSYS, Inc. May 19, 2014
2.5D PCB Simulation
ESD Analysis
− Reverse Voltage occurred in Schottky Diode.(50, 60, 242, 289MHz)
[PDS5100H] [S3M]
50MHz
60MHz
7.4E-01V
2.6E-01V
3.7E-01V
7.0E-02V
7.9E-03V 6.8E-01V
6.8E-03V 5.3E-01V

12. 12
SL Corporation Confidential.
The Contents may only be passed on, used or made known with our express permission. All rights reserved. © 2014 ANSYS, Inc. May 19, 2014
Discharge Path Simulation
PCB and ESD Source Modeling(HFSS)

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SL Corporation Confidential.
The Contents may only be passed on, used or made known with our express permission. All rights reserved. © 2014 ANSYS, Inc. May 19, 2014
Discharge Path Simulation
Analysis Summary and Test Case
• Analyzing Mode : HFSS Transient Solver
• Analyzing Time : ~24 hours with 12 CPU(3GHz)
• Test Case
1. Without RLC : bare PCB without any component
2. With RLC : only R/L/C modeled with Lumped RLC
• Analyzing Mode : SIwave Frequency sweep
• Test Case
1. With RLC

14. 14
SL Corporation Confidential.
The Contents may only be passed on, used or made known with our express permission. All rights reserved. © 2014 ANSYS, Inc. May 19, 2014
Discharge Path Simulation

15. 15
SL Corporation Confidential.
The Contents may only be passed on, used or made known with our express permission. All rights reserved. © 2014 ANSYS, Inc. May 19, 2014
Discharge Path Simulation
1 Layer
4 Layer
HFSS No RLC HFSS with RLC

16. 16
SL Corporation Confidential.
The Contents may only be passed on, used or made known with our express permission. All rights reserved. © 2014 ANSYS, Inc. May 19, 2014
Discharge Path Simulation
HFSS No RLC HFSS with RLC
3 Layer

17. 17
SL Corporation Confidential.
The Contents may only be passed on, used or made known with our express permission. All rights reserved. © 2014 ANSYS, Inc. May 19, 2014
Discharge Path Simulation
1 Layer
4 Layer
SIwave with RLC LED C output HFSS with RLC

18. 18
SL Corporation Confidential.
The Contents may only be passed on, used or made known with our express permission. All rights reserved. © 2014 ANSYS, Inc. May 19, 2014
Discharge Path Simulation
SIwave with RLC HFSS with RLC
3 Layer

19. 19
SL Corporation Confidential.
The Contents may only be passed on, used or made known with our express permission. All rights reserved. © 2014 ANSYS, Inc. May 19, 2014
• We can analyze ESD voltage, current level using
SIwave & Desinger SI
– Consider actual load placement / Circuit operation
• Also reverse voltage characterization similarly occurred
like the actual situation
• Prediction of Discharge path with RLC model
• Future work for HFSS transient(ESD)
− Add active component characterization
− Solving Method of big size model
Summary