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TISPPBL2SDR Datasheet(PDF) 11 Page - Power Innovations Ltd |
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TISPPBL2SDR Datasheet(HTML) 11 Page - Power Innovations Ltd |
11 / 15 page 11 AUGUST 1999 TISPPBL2SD PROGRAMMABLE OVERVOLTAGE PROTECTORS FOR ERICSSON COMPONENTS PBL 3xxx SLICS PR O D UC T I N FO R M A T IO N In the negative polarity, the PBL 3762A RING or TIP voltage must not exceed VBAT - 70. Continuously the PBL 3762A can withstand a VBAT of -70 V and this implies a maximum peak voltage of -140 V. Figure 15 is drawn for a VBAT of -50 V and so that the peak voltage becomes -120 V. For 250 ns, the PBL 3762A will be able to withstand a voltage between VBAT -40V and VBAT -70V or -90V and -120 V in this case. For 1 µs, the PBL 3796 will be able to withstand a voltage between VBAT -20V and VBAT -40 V or -70 V and -90 V in this case. For 10 ms, the PBL 3796 will be able to withstand a voltage between VBAT and VBAT -20 V or -50 V and -70 V in this case. By adding a series feed diode in the battery feed the d.c. and 10 ms voltage withstands increase to -70 V, independent of the actual VBAT value.To protect against negative overvoltage, the TISPPBL2S negative limiting voltage must be equal to or less than these voltage values during the specified time periods. The following table lists the protection requirements of three selections from different SLIC families. Two, the PBL 3796 and the PBL 3762A, specify voltage withstand. The PBL 3796 specifies the negative voltages in absolute terms and the PBL 3762A specifies the negative voltages in terms of voltage relative to the battery supply voltage, VBAT. Tertiary protection is incorporated in the PBL 386 20/1 SLIC and the withstand is specified in terms of current into this protection. This type of SLIC also has more time periods specified for the current withstand values. To co-ordinate the SLIC external secondary protection (TISPPBL2S) and the internal tertiary protection, a series resistor, RP, is required between the two. The tertiary protection will develop about 1 V and the withstand current through resistor RP will also develop a voltage. The sum of these voltages will determine the required limiting voltage level of the TISPPBL2S. A suitable value for RP is 2 Ω. The negative limiting voltage of the TISPPBL2S is defined as a 1 µs, -20 V pulse below the battery voltage (Figure 2). This value does not exceed any of the voltage withstand levels listed in the SLIC withstand table. In the positive polarity the TISPBL2S limits the maximum voltage to 8 V in a 1 µs period and between 1 V and 5 V for a 10 ms period. These values do not exceed the values listed in the SLIC withstand table. Figure 15. TRANSIENT LIMITS FOR PBL 3762A WITHSTAND VOLTAGE 10 ms 1 µs 0.25 µs PBL 3762A SLIC RING AND TIP VOLTAGE WITHSTAND vs TIME 0 5 10 15 Time 0.25 µs 1 µs 10 ms -120 -110 -100 -90 -80 -70 -60 -50 D.C. and 10 ms pulse rating increased to -70 V (independent of V BAT value) by use of series battery feed diode V BAT - 40 V V BAT - 70 V V BAT - 20 V V BAT AI6XBC |
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Similar Description - TISPPBL2SDR |
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