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NP1300SAMCT3G Datasheet(PDF) 5 Page - ON Semiconductor |
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NP1300SAMCT3G Datasheet(HTML) 5 Page - ON Semiconductor |
5 / 7 page NP−SAMC Series http://onsemi.com 5 and shorts the transient to ground, safely protecting the circuit. Figure 4. Normal and Fault Conditions Protected Equipment + − + − V(OP) I(OP) TSPD Normal Circuit Operation Protected Equipment + − + − V(Fault) I(Fault) TSPD Operation during a Fault I(Fault) •TSPD looks like an open •Circuit operates normally •Fault voltage greater than Vbo occurs •TSPD shorts fault to ground •After short duration events the O/V switches back to an open condition •Worst case (Fail/Safe) •O/V permanent short •Equipment protected The electrical characteristics of the TSPD help the user to define the protection threshold for the circuit. During the open circuit condition the device must remain transparent; this is defined by the IDRM. The IDRM should be as low as possible. The typical value is less than 5 mA. The circuit operating voltage and protection voltage must be understood and considered during circuit design. The V(BO)is the guaranteed maximum voltage that the protected circuit will see, this is also known as the protection voltage. The VDRM is the guaranteed maximum voltage that will keep the TSPD in its normal open circuit state. The TSPD V(BO) is typically a 20−30% higher than the VDRM. Based on these characteristics it is critical to choose devices which have a VDRM higher than the normal circuit operating voltage, and a V(BO) which is less than the failure threshold of the protected equipment circuit. A low on−state voltage Vt allows the TSPD to conduct large amounts of surge current (500 A) in a small package size. Once a transient surge has passed and the operating voltage and currents have dropped to their normal level the TSPD changes back to its open circuit state. 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. |
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