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SM14LV1 Fiches technique(PDF) 2 Page - Microsemi Corporation |
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SM14LV1 Fiches technique(HTML) 2 Page - Microsemi Corporation |
2 / 2 page Microsemi Scottsdale Division 8700 E. Thomas Rd. PO Box 1390, Scottsdale, AZ 85252 USA, (480) 941-6300, Fax: (480) 947-1503 Copyright 2001 MSCXXXX.PDF 9-20-2004 REV J TITE LAMP SM14LV1.7C TVSarray™ SCO T TSD A LE DIVISION Application Notes For Using The SM14LV1.7C TITEClampTM TVSarrayTM The SM14LV1.7C TITEClamp TVSarray is a 10 wire protector designed for clamping voltage spikes to lowest possible levels between the signal line and the Vcc supply or ground. This device incorporates Microsemi's proprietary "Self Programmable" feature that provides exceedingly tight clamping of only 1.7V maximum above signal line voltages ranging from 3.0V up through 30V. Destructive over-current is diverted through the plus and minus Vcc rails or ground for negative transients. One size fits all Downsizing of on chip components to sub-micron dimensions has improved performance, reduced component size and cost at the expense of lower failure voltage thresholds. The demand has surfaced for improved protection across data lines in highly automated manufacturing, monitoring and control systems. These environments are usually harsh and subject to conducted and induced transient voltages originating from sources including motors, solenoids and welders. The connection points are shown in figure 1. Pins 1 and 14 are connected to +Vcc, with pins 7 & 8 being either -Vcc or ground. The lines are spread out for purposes of illustrating the connections; however, the traces between signal lines and the TVS should be at an absolute minimum to reduce parasitic reluctance which causes overshoot per Faraday's laws of induction, V=L(di/dt). In figure 2, the segment for a single wire is detailed for improved illustration. A scaled illustration of clamping on a 12V signal line example is shown in figure 3. This depicts a small but acceptable rise in voltage above the signal during worse case transient conditions. Clamp Performance 12 V Signal Voltage V t 1.7V Max Clamp Level To Signal Line + Vcc - Vcc or Gnd Single Line Detail 7 6 5 4 3 2 1 8 9 10 11 12 13 14 1 2 3 4 5 10 9 8 6 7 TITE LAMP + VCC - VCC or Gnd Line Installation Figure 3. Figure 2. Figure 1. Precautions in component placement and board layout: 1. Place the SM14LV1.7C directly at the board/signal line interface. 2. Keep all traces short for both signal lines and Vcc (and ground if applicable). 3. Eliminate ground loops. If the reader has further technical questions, please contact Microsemi-Scottsdale applications engineering at 480-941-6433 or 480-941-6524. |
Numéro de pièce similaire - SM14LV1 |
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Description similaire - SM14LV1 |
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