TBU-CA065-300-WH_11 BOURNS | Alldatasheet

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Technical content

11/11 • FU1107 RS-485 Evaluation Board 2 Bill of MaterialsTable 1 No. Part Number Qty. Description Reference

1 TBU-CA065-300-WH 2 TBU® Single Bidirectional Line 650 V 300 mA TBU® HSP 1, TBU® HSP 2

2 MOV-10D201K 2 Single Line 10 mm MOV 200 V MOV1, MOV2

3 CDSOT23-SM712 2 Dual Bidirectional Line 7 V / 12 V TVS5

This evaluation board serves as an aid in evaluating circuit protection on RS-485 serial device port solutions using Bourns® TBU® High-Speed Protector (HSP), MOV and TVS products to meet the required industry standards on RS-485 port interfaces. The recommended Bourns® TBU® HSP solution offers enhanced performance features over competing technologies, which can help the design engineer to increase the surge & transient protection level on RS-485 ports and place the entire circuit protection solution into a smaller PCB area. Bourns has developed a RS-485 evaluation board (measuring 50 mm x 25 mm x 1.2 mm) manufactured using FR4 PCB with nickel gold plating on top and bottom sides. How to Connect the Evaluation Board for Test Set-up

  • Connect J1 and J2 to the exposed lines.
  • Connect J3 and J4 to the RS-485 IC device. * In addition to the two TBU® HSPs, the default configuration of this board uses two MOVs (MOV1, MOV2) and a single TVS diode array (TVS5). The board allows different configurations:
  • 2 MOVs (MOV1 and MOV2) may be replaced by a) 2 single 2031 GDTs (GDT1 and GDT2) or b) a dual 2030 GDT (GDT3, not yet released)
  • 1 TVS diode array (TVS3) may be replaced with a) 2 SMB TVS diodes (TVS1, TVS2) or b) 2 SOT23 TVS diodes (TVS3, TVS4) or c) 2 SOT23-5 thyristor devices (TISP1, TISP2) RS-485 Evaluation Board 2 Top Side Layout* RS-485 Evaluation Board 2 Schematic Figure 2 Figure 1 TBU® HSP 1 TVS5 TISP1 TISP2 TVS1 TVS2 TVS3 TVS4 GDT3 GDT1MOV1 Line A Unprotected 40 mils traceP rotected Load A Line B Unprotected 40 mils traceP rotected Load B GDT2MOV2 TBU® HSP 2 12 21 II I I I II II III NU NU 212

RS-485 Port Protection Evaluation Board 2 Performance Graphs 11/11 • FU1107 ESD +8 KV Contact Discharge (IEC-61000-4-2) Surge 1.2/50 5 KV

120 Vrms 28 Vrms

Ch 1: input voltage / surge / fault to TBU® HSP Ch 4: TBU® HSP current Ch1 Ch1 116 VMA 400 ns 31.60 %

1.00 A ΩCh4

-20.5 V Tr ig?Pr eV u Ch4 Ma x 1.98 A Ch4 Mi n -81.1 mA T T The ohm unit following the current units shown for Channel 4 (i.e. AOhm) indicates that a 50 ohm termination was used internal to the oscilloscope T Ch 1: input voltage / surge / fault to TBU® HSP Ch 4: TBU® HSP current Ch1 Line 116 VMA 4.00 ms 20.20 % 200 mA ΩCh4 100 V Ch1 Ma x 124.4 V Run Tr ig ’d Ch4 Ma x 365.4 mA Ch4 Mi n -322.4 mA T T The ohm unit following the current units shown for Channel 4 (i.e. AOhm) indicates that a 50 ohm termination was used internal to the oscilloscope T Ch 1: input voltage / surge / fault to TBU® HSP Ch 4: TBU® HSP current Ch1 Line 116 VMA 4.00 ms 20.20 % 200 mA ΩCh4 20.0 V Ch1 Ma x 28.3 V Run Tr ig ’d Ch4 Ma x 451.8 mA Ch4 Mi n -395.7 mA T T The ohm unit following the current units shown for Channel 4 (i.e. AOhm) indicates that a 50 ohm termination was used internal to the oscilloscope T Reference For more information on implementing advanced circuit protection technologies for RS-485 ports, please review the Bourns RS-485 application note: http://www.bourns.com/data/global/pdfs/Bourns_RS-485_AppNote.pdf “TBU” is a registered trademark of Bourns, Inc. in the U.S., Taiwan and European Community. “Bourns” is a registered trademark of Bourns, Inc. in the U.S. and other countries. COPYRIGHT© 2011 • BOURNS, INC. • 11/11 • e/FU1107 For further technical support and for complete circuit protection solutions, please visit www.bourns.com Ch 1: input voltage / surge / fault to TBU® HSP Ch 4: TBU® HSP current Ch1 Ch1 -380 VMA 10.0 ns 20.40 %

5.00 A ΩCh4

-390 V Trig?Run Ch4 Max 11.3 mA Ch4 Min -2.55 A T T The ohm unit following the current units shown for Channel 4 (i.e. AOhm) indicates that a 50 ohm termination was used internal to the oscilloscope T