dential
实用工具
Sales Guides PortNotes Solutions Application Notes
Bourns TBUTM White Paper Generator Interface Protection RS-485 Port Protection
TBU
A B VB
S
LOAD
100 ohms
Internal GDT triggers 2nd and shunts to ground
Surge – 2500V, 1/50 μsec
VA
13 Company Confidential
电路防护的等级
TBU提供给您高能量等级的防护
High Energy Surge Protection
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TBU 特点
Lightning test circuit
TBU
A B TBU blocks surge at 40 V VB
S
LOAD
100 ohms
1000 V
VA Surge
Surge – 1000V, 1/50 μsec
TBU protects
AC Power cross test circuit
TBU
A B 2nd
3rd VB 4th
S
LOAD
100 ohms
Voltage – 600Vac 12 Company Confidential
AC Source
VA
TBU雷击试验分析
Lightning test circuit
TBU blocks surge first at VB = 40V
15 Company Confidential
基本的电压保护模型
Signal Line OVP2 TBU OVP1
Protected Circuit
OVP1 (usually a small TVS) sets the overvoltage protection threshold
OVP1 may be included in the Protected Circuit
9 Company Confidential
TBU 过电流保护工作原理
TBU
CURRENT VOLTAGE LIMITING DISCONNECT
LOAD
S
short
EVENT
1. Short circuit 2. Current rises to I trip limiting in effect Current
*Plan to support existing business, no EOL planned, not recommended for new designs
8 Company Confidential
TBU 工作原理介绍
Device that triggers when current is above trip point.
Provides resistibility against lightning and power induced faults
Moderate Energy Surge Protection
Typically need to add components to increase energy resistibility
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工业界面的保护 1
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工业界面的保护2
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TBU 的优势
Example: RS-485 Port Protection
TVS/Resistor Solution TBU solution
21 Company Confidential
实用工具
Product Datasheets
TBU-CA Series TBU-CX Series TBU-KE Series TBU-DT Series TBU-PL Series TBU-PK Series Get more information on
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Bourns 电路保护 – 过压保护
TVS二极管 (钳位)
GDT气体放电管 (消弧)
TISP晶体闸流管 (消弧)
ESD多样静电放电保护技术 (钳位)
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TBU 选型表
7 Company Confidential
TBUTM 新一代产品
54% Smaller Package Broader Itrig range Lower Series Resistance
TBU-PK Series Dual V-I Trig. 80Ω
Cxxx Series*
24% Smaller Package Broader Itrig range Lower Series Resistance
TBU-CA Series Single Bi-Dir
TBU-CX Series Single Prog Bi-Dir
Low Energy Surge Protection
Basic ESD protection if IC structures are not adequate
Protected IC
Sometimes contains sufficient protection inside the chip for low energy surges
领先全球之电路保护解决方案
白玉成 应用工程师
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Bourns® 保护器件分类
Multifuse® CPTC TelefuseTM SinglFuseTM
TBUTM Over Current Protection Over Voltage Protection LPM
GDT
TISP®
TVS Diode
Chip Guard®
OSP
3 Company Confidential
Bourns 电路保护产品系列 – 过流保护
TeleFuse® - 电信用高压保险丝 (一次熔断式) SinglFuse™ - 薄膜保险丝 (一次熔断式) Multifuse® - 聚合物PTC保险丝 (自恢复式 ) CPTC – 陶瓷PTC保险丝(自恢复式 ) TBU – 场效管触发器(自恢复式 )
Applications
•Ethernet Port for Industrial •RS Comm Port for Transportation (Rail) •LVDS for Telecom and Industrial
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TBU目标市场和应用
TBU配合Bourns 其他电路防护元器件给您提供专业完 整的保护方案
工业市场的应用
RS-485 LVDS RS232 RS422 CANBUS Microwave Links Factory Process Controls Smart Grid Communications Building HVAC Systems Ethernet Conveyor Systems Automated Test Equipment (ATE) I/O Signals Avionics Rail Communications Security & Surveillance Systems Home Automation Elevator / Escalator Controls
S
EVENT
1. Lightning, power cross occurs 2. Current rises to I trip limiting in effect Current
3. Voltage limiting circuit disconnects voltage & current 4. Protected
14 Company Confidential
基本的电流保护模型
Signal Line OVP TBU
Protected Circuit
The TBU device limits I/O current. The OVP (GDT, TSP, or MOV) protects the TBU from high voltage. The OVP (MOV) also provides the minimum ESD protection for the TBU device. Applications where the protected signal line also delivers power (AC or DC) will require more sophisticated engineering.
Evaluation Boards
SLIC Eval PCB RS-485 Eval PCB VDSL Eval PCB
23 Company Confidential
RS-485 接口防护方案 –TBU功能测试板
Figure 1: RS-485 Evaluation Board Schematic
The TBU device limits current into OVP1. OVP2 (GDT, TSP, or MOV) protects the TBU from high voltage.
16 Company Confidential
TBU的应用
TBU Training
•TBU Basics •TBU Presentation •TBU Application Notes and White Paper