ZHCSIV5B September 2018 – September 2022 TVS3301
PRODUCTION DATA
If the TVS3301 is in place to protect the device, the voltage will rise to the breakdown of the diode at 37.5 V, during a surge event. The TVS3301 will then turn on to shunt the surge current to ground. With the low dynamic resistance of the TVS3301, large amounts of surge current will have minimal impact on the clamping voltage. The dynamic resistance of the TVS3301 is around 35 mΩ, which means a 24-A surge current will cause a voltage raise of 24 A × 35 mΩ = 0.84 V. Because the device turns on at 37.5 V, this means the XTR115 input will be exposed to a maximum of 37.5 V + 0.84 V = 38.34 V during surge pulses, well within the absolute maximum input voltage to ensure robust protection of the circuit.
Because the TVS3301 is a bidirectional device, it also satisfies the condition for withstanding reverse wiring. In this case, if VLOOP is wired in reverse, the input terminal of the TVS3301 will see –24 V, which is below the negative VRWM. The leakages will be the same as if the battery is wired properly.
The small size of the device also improves fault protection by lowering the effect of fault current coupling onto neighboring traces. The small form factor of the TVS3301 allows the device to be placed extremely close to the input connector, which lowers the length of the path fault current going through the system compared to larger protection solutions. Finally, the low leakage of the TVS3301 will have low input power losses. At 33 V, the device will see typical 2.5-nA leakage for a constant power dissipation of less than 100 µW, a small quantity that will minimally effect overall efficiency metrics and heating concerns.