TIDUEM8B March   2019  – February 2021

 

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2.2.9 TVS1800

The TVS1800 device robustly shunts up to 40 A of IEC 61000-4-5 fault current to protect systems from high power transients or lightning strikes. The device offers a solution to the common industrial signal line EMC requirement to survive up to ±1 kV IEC 61000-4-5 open circuit voltage coupled through a 42-Ω impedance. The TVS1800 device uses a unique feedback mechanism to ensure precise flat clamping during a fault, assuring system exposure below 25 V. The tight voltage regulation allows designers to confidently select system components with a lower voltage tolerance, lowering system costs and complexity without sacrificing robustness. In addition, the TVS1800 device is available in a small 2-mm × 2-mm SON footprint which is ideal for space-constrained applications, offering a 70 percent reduction in size compared to industry standard SMA and SMB packages. The extremely low device leakage and capacitance ensure a minimal effect on the protected line. To ensure robust protection over the lifetime of the product, TI tests the TVS1800 device against 5,000 repetitive surge strikes at high temperature with no shift in device performance. In this design, the TVS1800 device is placed at the input of the TPS25921L device to protect it from any transient voltages that would occur from the TPS25921L disconnecting the load during overcurrent, overvoltage, or undervoltage events.