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NP1300SBMCT3G Datasheet(PDF) 6 Page - ON Semiconductor |
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NP1300SBMCT3G Datasheet(HTML) 6 Page - ON Semiconductor |
6 / 7 page NP−SBMC Series http://onsemi.com 6 Normal System Operating Voltage Equipment Failure Threshold Time Transient Surge TSPD Protection (short) Figure 5. Protection During a Transient Surge TSPD Transparent (open) TSPD Transparent (open) TSPD Protection Voltage Upper Limit TSPD’s are useful in helping designers meet safety and regulatory standards in Telecom equipment including GR−1089−CORE,ITU−K.20, ITU−K.21, ITU−K.45, FCC Part 68, UL1950, and EN 60950. ON Semiconductor offers a full range of these products in the NP series product line. DEVICE SELECTION When selecting a TSPD use the following key selection parameters. Off−State Voltage VDRM Choose a TSPD that has an Off−State Voltage greater than the normal system operating voltage. The protector should not operate under these conditions: Example: Vbat = 48 Vmax Vring = 150 Vrms = 150*1.414 = 212 V peak VDRM should be greater than the peak value of these two components: VDRM > 212 + 48 = 260 VDRM Breakover Voltage V(BO) Verify that the TSPD Breakover Voltage is a value less than the peak voltage rating of the circuit it is protecting. Example: Relay breakdown voltage, SLIC maximum voltage, or coupling capacitor maximum rated voltage. Peak Pulse Current Ipps Choose a Peak Pulse current value which will exceed the anticipated surge currents in testing. In some cases the 100 A “C” series device may be needed when little or no series resistance is used. When a series current limiter is used in the circuit a lower current level of “A” or “B” may be used. To determine the peak current divide the maximum surge current by the series resistance. Hold Current (IH) The Hold Current must be greater than the maximum system generated current. If it is not then the TSPD will remain in a shorted condition, even after a transient event has passed. TYPICAL APPLICATION Figure 6. ADSL Tip Ring Voice NP3100SBMC NP3100SBMC DSL |
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