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ISO150AU Datasheet(PDF) 6 Page - Burr-Brown (TI) |
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ISO150AU Datasheet(HTML) 6 Page - Burr-Brown (TI) |
6 / 9 page 6 ® ISO150 TYPICAL PERFORMANCE CURVES (CONT) T A = +25°C, VS = +5V unless otherwise noted. ISOLATION BARRIER Data is transmitted by coupling complementary logic pulses to the receiver through two 0.4pF capacitors. These capaci- tors are built into the ISO150 package with Faraday shield- ing to guard against false triggering by external electrostatic fields. The integrity of the isolation barrier of the ISO150 is verified by partial discharge testing. 2400Vrms, 60Hz, is applied across the barrier for one second while measuring any tiny discharge currents that may flow through the barrier. These current pulses are produced by localized ionization within the barrier. This is the most sensitive and reliable indicator of barrier integrity and longevity, and does not damage the barrier. A device fails the test if five or more current pulses of 5pC or greater are detected. FIGURE 1. Basic Operation Diagram. Conventional isolation barrier testing applies test voltage far in excess of the rated voltage to catastrophically break down a marginal device. A device that passes the test may be weakened, and lead to premature failure. APPLICATIONS INFORMATION Figure 1 shows the ISO150 connected for basic operation. Channel 1 is configured to transmit data from side B to A. Channel 2 is set for transmission from side A to B. The R/T pins for each of the four transceivers are shown connected to the required logic level for the transmission direction shown. The transmission direction can be controlled by logic signals applied to the R/T pins. Channel 1 and 2 can be independently controlled for the desired transmission direction. TYPICAL INSULATION RESISTANCE vs TEMPERATURE 1016 1015 1014 1013 1012 1011 1010 0 20 40 60 80 100 120 140 160 180 Temperature (°C) NOTES: (1) Power Supplies and grounds on side A and side B are isolated. (2) Recommended bypass: 0.1 µF in parallel with 1nF. Data In +5V(1) +5V(1) (1) (1) (2) (1) (1) (2) Channel 2 Data Out Channel 1 Data Out Channel 2 Data In Channel 1 (Transmit) (Transmit) (Receive) (Receive) Channel 2 Channel 1 Side A Side B GA D2A R/T2A D2B VSB R/T2B D1B GB R/T1B VSA D1A R/T1A |
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