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LC04-12TB датащи(PDF) 5 Page - Semtech Corporation |
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LC04-12TB датащи(HTML) 5 Page - Semtech Corporation |
5 / 8 page 5 ã 2000 Semtech Corp. www.semtech.com PROTECTION PRODUCTS PROTECTION PRODUCTS LC04-12 Configuring The LC04-12 for Central Office ADSL Applications For Central Office applications, the LC04-12 can be configured for operation to 24V with the addition of two external steering diodes. This is accomplished by connecting two adjacent legs of the LC04-12 in series and adding the steering diodes as shown in Figure 4. Each of the TVS diodes has a working voltage of 12V. Since the voltages are additive when series connected, the device will have a working voltage of 24V. The power rating of the device is effectively doubled since the surge current capability remains unchanged. During positive duration transients, the internal TVS diodes of the LC04-12 will be reversed biased when the line voltage exceeds 24V. Transient current will flow through the LC04-12 to ground. For negative duration transient, the external steering diodes (D1 & D2) will be forward biased when the voltage exceeds the forward voltage (V F) of the device. The steering diodes are required to insure that the internal compensation diodes of the LC04-12 are not reverse biased as this would result in their destruction. The ES1A ultrafast rectifiers have been found to work well in this application. These devices will survive the Bellcore 1089 (intra-building) and ITU K.20/K.21 surges and have a repetitive reverse voltage rating of 50V, and a typical junction capacitance of 10pF. The total capacitance seen by the line will typically be <25pF. This is determined by the sum of the capaci- tance of the steering diode and 1/2 of the capacitance of each line pair of the LC04-12. Applications Information (Continued) |
Аналогичный номер детали - LC04-12TB |
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Аналогичное описание - LC04-12TB |
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