CAN總線保護(hù)TVS二極管陣列選型
發(fā)表日期:2020-12-18瀏覽:2509
盡管CAN總線具有很強(qiáng)的抗干擾能力,但是在實(shí)際應(yīng)用中,其仍然會(huì)受到靜電以及浪涌的干擾。要知道,浪涌是幾種瞬態(tài)騷擾中能量最高之一,其過(guò)電流很大,可達(dá)到kA級(jí)別,浪涌過(guò)電壓和過(guò)電流會(huì)嚴(yán)重地造成CAN總線電路損壞,影響相關(guān)設(shè)備的正常運(yùn)行。為了提高CAN總線抗浪涌防護(hù)能力,電子工程師會(huì)選用各種電路保護(hù)器件(如:TVS二極管陣列、陶瓷氣體放電管、壓敏電阻等)為其保駕護(hù)航。接下來(lái),重點(diǎn)介紹幾種比較常用的CAN總線保護(hù)TVS二極管陣列。
1)PESD1CAN/PESD2CAN
PESD1CAN/PESD2CAN采用小型SOT-23表面貼裝設(shè)備(SMD)塑料封裝,設(shè)計(jì)用于保護(hù)兩條車用控制器局域網(wǎng)(CAN)總線免除靜電放電(ESD)和其他瞬態(tài)電壓導(dǎo)致的損壞。
400瓦峰值脈沖功率(tp=8/20μs)
SOT-23封裝
響應(yīng)時(shí)間通常小于1ns
Protects one bidirectional line or two unidirectional lines
工作電壓:24V
低箝位電壓、低結(jié)電容
Solid-state silicon avalanche technology
IEC 61000-4-2 (ESD) ±30kV (air), ±30kV (contact)
IEC 61000-4-4 (EFT) 40A (5/50ns)
IEC 61000-4-5 (Lightning) 8A (8/20μs)Molding compound flammability rating:UL 94V-0
符合RoHS
2)HDW24M2T-B
350 watts peak pulse power (tp = 8/20μs)
Response Time is Typically < 1 ns
Protects one bidirectional line or two unidirectional lines
Working Voltages: 24V
JEDEC SOT-23 package
Low clamping voltage
IEC 61000-4-2 (ESD) ±30kV (air), ±30kV (contact)
IEC 61000-4-4 (EFT) 40A (5/50ns)
IEC 61000-4-5 (Lightning) 6A (8/20μs)
AEC-Q101 Qualified
RoHS Compliant
3)DW24M2T-B-S
350 watts peak pulse power (tp = 8/20μs)
JEDEC SOT-23 package
Response Time is Typically < 1 ns
Protects one bidirectional line or two unidirectional lines
Working Voltages: 24V
Low clamping voltages
IEC 61000-4-2 (ESD) ±30kV (air), ±30kV (contact)
IEC 61000-4-4 (EFT) 40A (5/50ns)
IEC 61000-4-5 (Lightning) 6.5A (8/20μs)
RoHS Compliant
在CAN總線浪涌靜電保護(hù)中,PESD1CAN、PESD2CAN、HDW24M2T-B、DW24M2T-B-S這四種TVS二極管陣列是市場(chǎng)中應(yīng)用比較多的電路保護(hù)器件,市場(chǎng)應(yīng)用成熟、穩(wěn)定、高可靠性。具體選用哪種TVS二極管陣列為CAN總線安全保駕護(hù)航,還需在技術(shù)的指導(dǎo)下完成。