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TS2411CD 데이터시트(PDF) 5 Page - Taiwan Semiconductor Company, Ltd |
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TS2411CD 데이터시트(HTML) 5 Page - Taiwan Semiconductor Company, Ltd |
5 / 6 page TS2411 5-6 2004/09 rev. B Application Note Pin 2 allows connection of an external resistor RSL, which is used to program the solpe of the supply current vs supply voltage characteristics (see Fig2), and hence the supply current up to the initiation voltage ( VSI ). This initiation voltage remains constant independent of RSL. The supply current drawn prior to triggering varies inversely with RSL, decreasing for increasing value of resistance. Thus, increasing the value of RSL will decrease the amount of AC ringing current required to trigger the device. As such, longer sucribser loops are possible since less voltage is dropped per unit length of loop wire due to the lower current level. RSL can also be used to compensated for smaller AC couplin capacitors (C5 on Fig 3) (higher impedance) to the line which can be used to alter the ringer equivalence number of a tone ringer circuit. The graph in Fig2 illustrates the variation of supply current with supply voltage. Three curves are drawn to show the variation of initiation current with RSL. Curve B( RSL=6.8KW) shows the I-V characteristic for the TS2411 tone ringer. Curve A is a plot with RSL<6.8KW and shows an increase in the current drawn up to the initiation voltage VSI. The I-V characteristic after initiation remains unchanged. Curve C illustrates the effect of increasing RSL above 6.8KW initiation current decreases but again current after triggering is unchanged. Characteristics Curve Figure 4. Figure 5. |
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유사한 설명 - TS2411CD |
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