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TVB270SA-L Datasheet(PDF) 2 Page - Tyco Electronics |
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TVB270SA-L Datasheet(HTML) 2 Page - Tyco Electronics |
2 / 12 page 340 SiBar Thyristor Surge Protectors Raychem Circuit Protection 4 Selection Guide for SiBar Thyristor Surge Protectors Step 1. Determine the circuit’s operating parameters. Fill in the following information about the circuit: Maximum ambient operating temperature ______________________ Maximum DC supply voltage (V DC Max..) ________________________ Maximum ringing (AC) voltage (V AC Max.) ______________________ System voltage damage threshold __________________________ Maximum fault current and duration __________________________ Maximum system operating current __________________________ Applicable industry requirements __________________________ Step 2. Calculate the maximum operating voltage of your system. Maximum operating voltage = V DC Max. + (1.414 x VAC Max.) Refer to Table V1 to select a SiBar thyristor device with a maximum off- state voltage (V DM) rating that is close to, but greater than, the maxi- mum operating voltage of your system. Step 3. Verify that the system voltage damage threshold is greater than the rated maximum breakover voltage (V BO). Refer to Table V1 to confirm that the maximum breakover voltage of the device you selected in Step 2 is less than the system voltage damage threshold. |
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