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TISP61511D Datasheet(PDF) 7 Page - Bourns Electronic Solutions |
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TISP61511D Datasheet(HTML) 7 Page - Bourns Electronic Solutions |
7 / 9 page JULY 1995 — REVISED MARCH 2006 Specifications are subject to change without notice. Customers should verify actual device performance in their specific applications. TISP61511D Gated Protectors APPLICATIONS INFORMATION Electrical Characteristics The electrical characteristics of a thyristor overvoltage protector are strongly dependent on junction temperature, TJ. Hence a characteristic value will depend on the junction temperature at the instant of measurement. The values given in this data sheet were measured on commercial testers, which generally minimize the temperature rise caused by testing. Application Circuit Figure 3 shows a typical TISP61511D SLIC card protection circuit. The incoming line wires, R and T, connect to the relay matrix via the series overcurrent protection. Fusible resistors, fuses and positive temperature coefficient (PTC) resistors can be used for overcurrent protection. Resistors will reduce the prospective current from the surge generator for both the TISP61511D and the ring/test protector. The TISP7xxxF3 protector has the same protection voltage for any terminal pair. This protector is used when the ring generator configuration may be ground or battery-backed. For dedicated ground-backed ringing generators, the TISP3xxxF3 gives better protection as its inter-wire protection voltage is twice the wire to ground value. Relay contacts 3a and 3b connect the line wires to the SLIC via the TISP61511D protector. The protector gate reference voltage comes from the SLIC negative supply (VBAT). A 220 nF gate capacitor sources the high gate current pulses caused by fast rising impulses. Impulse Conditions Most lightning tests, used for equipment verification, specify a unidirectional sawtooth waveform which has an exponential rise and an exponential decay. Wave shapes are classified in terms of Peak Amplitude (voltage or current), rise time and a decay time to 50 % of the maximum amplitude. The notation used for the wave shape is amplitude, rise time/decay time. A 38 A, 5/310 µs wave shape would have a peak current value of 38 A, a rise time of 5 µs and a decay time of 310 µs. There are three categories of surge generator type; single wave shape, combination wave shape and circuit defined. Single wave shape generators have essentially the same waveshape for the open circuit voltage and short circuit current (e.g. 10/1000 µs open circuit voltage and short circuit current). Combination generators have two wave shapes, one for the open circuit voltage and the other for the short circuit current (e.g. 1.2/50 µs open circuit voltage and 8/20 µs short circuit current). Circuit specified generators usually equate to a combination generator, although typically only the open circuit voltage waveshape is referenced (e.g. a 10/700 µs open circuit voltage generator typically produces a 5/310 µs short circuit current). If the combination or circuit defined generators operate into a finite resistance the wave shape produced is intermediate between the open circuit and short circuit values. Figure 3. Typical Application Circuit TEST RELAY RING RELAY SLIC RELAY TEST EQUIP- MENT RING GENERATOR S1a S1b R1a R1b RING WIRE TIP WIRE Th1 Th2 Th3 Th4 Th5 SLIC SLIC PROTECTOR RING/TEST PROTECTION OVER- CURRENT PROTECTION S2a S2b TISP 61511D TISP 3xxxF3 OR 7xxxF3 S3a S3b V BAT 220 nF AI6XAA |
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