6DD1792-0AB0

6DD1792-0AB0

6DD1792-0AB0

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厦门莫格电气自动化有限公司

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由于制造商标明的控制回路速度各有不同，所以在工作台上用相同测试条件对几个样本进行比较。同样，传播延时从检测出故障开始，直到栅极电压被下拉到模拟电流设定点为止。

使用浮动控制器时，需要添加额外的电阻器，称为Rshunt。如像UCCx921、ADM1070和LTC4151均为“浮动”控制器，就意味着器件里都含有一个电压调节器，该调节器在地和-48V线路之间与一个分流电阻器串联。UCCx921有一个zui小9V的调节电压，因此其Rshunt消耗的功率为：

PRshunt=(Vinmax-Vregmin)2/Rshunt

建议以zui小Vin向调节器提供至少2.5mA偏流，因此

Rshunt=(Vinmin-Vrefmax)/2.5mA=35V/2.5mA=14KΩ。

使用10KΩ时，

PRshunt=(75V-9V)2/10KΩ=0.44W

所以应使用至少1W的电阻器。

此外，控制器可以让整个线电压通过其自身。例如ISL6141可以通过线电压，其额定值为100V。为了承受可能时长为1μs的200V瞬时电压，必须添加一个瞬时电压抑制器以保护控制器。添加瞬时电压抑制器并不总是一件简单的任务，因为系统工程师经常不知道系统的zui大瞬时电压大小。

选择Rsense

为了选择Rsense的值，需要知道热插拔电路所需的峰值电流。例如你正在建立什么样的电源？它必须提供多大的峰值功率？制造商建议使用什么输入电容器或过滤器？

电路板将插入-48V背板中，所以要一个1.2V输出和60A峰值负载或72W转换器。和大多数电源制造商一样，建议在电源的Vin(+)引脚和Vin(-)引脚之间加一个220μF电容器，输入线电压可以在-75V至-35V之间，制造商在60A负载时zui大输入电流为2.8A。另外你也可以自己计算该电流，zui大输入电流出现于负载功率zui大且输入电压zui小时，即

IInput max=Pout max/(Vin min×η)

=72W/(36V×0.72)=2.8A

其中η是该线路和负载条件下的zui差效率。

选择MOSFET

根据要满足的技术规范，ETSI ETS300 132-2(100V瞬时电压持续100ms)或Bell Core Gr-513-CORE电信规范均可保证抵抗持续10ms -75V、持续10μs -100V和持续1μs -200V电涌。如果系统规范是承受100ms 100V电压,则需选择一个100V MOSFET，我们希望热插拔MOSFET上的电压降zui小，同时使功率损失也zui小。非故障条件下MOSFET的zui大功率损失为：

P=Imax2×Rds(on)

如果考虑使用D2Pak封装的NTB52N10，其额定值为100V BVDSS，则在Vgs=10V时zui大Rds(on)为30mΩ。zui大Pwr(on)损失

P=Ipk2×Rds(on)max=2.82×0.03=0.24W

短路时的安全性

负载短路时，全部Vin都加在MOSFET上。这是zui糟糕的情况，电流只受MOSFET Rds(on)和熔断丝电阻的限制。从控制器的技术规范出发，假定你正使用一个具有3μs传播延时的控制器，用于响应故障并下拉MOSFET基准以维持模拟电流限制，则zui坏情况下的电流为：

Ifaultworstcase=Vinmax/(Rds(on)+Rfuse)=75V/(0.030+0.035)=1,154A

当然，随着MOSFET温度上升，其Rds(on)也将上升，zui后从MOSFET曲线的线性区移到饱和区，MOSFET将自行限制到180A左右，短路时的功率为：

Pwrshortcircuit=Vinmax×Imax=75V×180A=13,500W

现在市场上有很多热插拔控制器出售，请密切注意所选择的电流驱动控制器的速度和驱动能力。Rsense电路断路器限制电压设为可接受的电大输入电流，同时必须检查短路情况下MOSFET的zui差结温，它必须低于zui大额定操作结温以确保设计安全可靠。

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