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TISP4219M3BJR-S Datasheet(PDF) 11 Page - Bourns Electronic Solutions |
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TISP4219M3BJR-S Datasheet(HTML) 11 Page - Bourns Electronic Solutions |
11 / 15 page JUNE 2001 – REVISED FEBRUARY 2005 Specifications are subject to change without notice. Customers should verify actual device performance in their specific applications. TISP4xxxH3/M3BJ Series for LCAS Protection LCAS Switch Ratings Equivalent Circuit Figure 13 shows the LCAS switch voltage ratings as breakdown diodes, which must not be allowed to conduct. Each switch has three diodes; one between poles and the other two from each pole to ground. At 25 °C, switches SW1 through to SW3 have breakdown diode voltages of ±320 V. Switch SW4 has breakdown diode voltage values of ±465 V for the one between poles and ±320 V for the two diodes connected to ground. Note that only protection to ground is required, as in the limit, the inter-switch voltage limitation of ±640 V is the same as the switch to ground limitation of +320 V and -320 V in both polarities. When a switch is in the off state, the maximum withstand voltage may be set by the switch itself or by the control line to the switch. At 25°C, the switch terminal to ground voltage rating for all the switches is ±320 V. Switches SW1 to SW3 are bidirectional MOS types and can withstand ±320 V between terminals. Switch SW4 is a bidirectional thyristor which is rated at ±465 V between terminals. Overcurrents as well as overvoltages occur on telephone lines. In the on state, the thyristor switch, SW4, is capable of withstanding high levels of current overload. For currents above about 200 mA, the MOS switches, SW1 to SW3, will go into a current limited condition. This will cause the voltage to rise across the switch and large amounts of power to be developed. In the longer term, this power loss increases the overall chip temperature. When the temperature exceeds about 125 °C, thermal shutdown occurs and the switches are set to the off state. Without power loss, the LCAS will cool. Eventually, the thermal trip will reset, setting the switches back in the high power loss condition again. The cycle of temperature increase, thermal shutdown, temperature decrease and switch re-activation will continue until the overcurrent ceases. Figure 13. LCAS Shown with Switch Breakdown Limits RING RELAY SLIC RELAY RING GENERAT OR SW5a SW5b R1 R2 V BAT ±√ √ √ √2xVRING Th1 Th2 Th3 Th4 SLIC V bat RING TIP SW3 SW4 SW1 SW2 +√ √ √ √2xVRING -√ √ √ √2xV RING V BAT 0 RING WIRE TIP WIRE V BAT + √ √ √ √2xVRING V BAT - √ √ √ √2xVRING V BAT 0 RING WIRE TIP WIRE GROUND-BACKEDRINGING SW5 AS SHOWN BATTERY-BACKED RINGING SW5 OPERATED R1 R2 AI4XAR TISP4125M3 OR TISP4125H3 TISP4219M3 OR TISP4219H3 |
Similar Part No. - TISP4219M3BJR-S |
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Similar Description - TISP4219M3BJR-S |
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