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TBU-CA085-300-WH Datasheet(PDF) 2 Page - Bourns Electronic Solutions |
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TBU-CA085-300-WH Datasheet(HTML) 2 Page - Bourns Electronic Solutions |
2 / 8 page 2 TBU-based Solution Device Selection Step 1: Current characterization: Determine the peak system operating current and maximum operating ambient temperature. Use the TBU® device data sheet’s “trigger current versus temperature” derating curve to determine the TBU® device derating value. Step 2: Overvoltage selection: Select an overvoltage device that has the lowest available DC breakdown voltage greater than the normal system voltages and any expected AC power faults. The selected device must also be capable of handling the required lightning current. Step 3: TBU® device selection: Choose a TBU® device with a maximum impulse voltage (Vimp) greater than the maximum impulse breakover or clamping voltage of the selected overvoltage protector. The selected TBU® device must also have a minimum specified Itrigger above the maximum peak system operating current compensating for the temperature derating. Step 4: Tertiary protection: In most applications, the protected circuit sources sufficient current to trigger the TBU® device. If the protected circuit impedance is high, a small avalanche diode to ground or small signal diodes clamping to the power supply rails may be placed after the TBU® device. This will ensure that the TBU® device triggers, preventing the voltage at the interface from rising to unsafe levels. Basic TBU® Device Operation Bourns® TBU® high-speed protectors are circuit protection devices constructed using MOSFET semiconductor technology. When placed in series in the system, the TBU® protector monitors the current flowing through the line. If the current exceeds a preset level, the TBU® device triggers, providing an effective barrier to large, destructive voltages or currents during surge events, thereby protecting sensitive electronics. The TBU® device operates in approximately 1 μs - once line current exceeds the TBU® device’s trigger current Itrigger. When operated, the TBU® device restricts line current to less than 1 mA typically, and blocks voltages including the surge up to rated limits. After the surge, the TBU® automatically resets itself when the voltage across the TBU® device falls to the Vreset or below. Therefore, the TBU® device will automatically reset on lines which have no DC bias or have DC bias below Vreset (such as unpowered signal lines). If the line has a normal DC bias above Vreset, the voltage across the TBU® device may not fall below Vreset after the surge. In such cases, special care needs to be taken to ensure that the TBU® device will reset; software monitoring may be used to accomplish this task. Bourns application engineers can provide further assistance. Key Features: • TBU® device is used in series with the line • TBU® device is triggered by current rise • TBU® device can block voltages up to 850 V, enabling easy coordination • TBU® device provides superior protection in less than 1 µs • TBU® device resets on voltage • TBU® device offers an extremely low capacitance per line Key Benefits: • High-speed performance • Blocks voltages and currents • Extremely low let-through energy of 100 nJ • Self-resetting on non-DC biased lines • Very high bandwidth up to 3 GHz • Small size in DFN package • TBU-PL & TBU-PK series offer voltage triggering • Smallest PCB area • Ultra low profile Bourns® TBU® Product Overview TBU-VI Curve I I OP Forward Trigger Current Residual Reset Current Reset Voltage Threshold Reset Voltage Threshold Reverse Trigger Current 1/R -I OP V |
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