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V661DB40 Datasheet(PDF) 3 Page - Littelfuse |
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V661DB40 Datasheet(HTML) 3 Page - Littelfuse |
3 / 4 page 88 www .littelfuse .com Varistor Products High Energy Industrial DA/DB Varistor Series Power Dissipation Ratings Should transients occur in rapid succession, the average power dissipa- tion required is simply the energy (watt- seconds) per pulse times the number of pulses per second. The power so developed must be within the specifications shown on the Device Ratings and Specifications table for the specific device. Furthermore, the operating values need to be derated at high temperatures as shown in Figure 1. Because varistors can only dissipate a relatively small amount of average power they are, therefore, not suitable for repetitive applications that involve substantial amounts of average power dissipation. FIGURE 1. CURRENT, ENERGY AND POWER DERATING CURVE 100 90 80 70 60 50 40 30 20 10 0 -55 50 60 70 80 90 100 110 120 130 140 150 AMBIENTTEMPERATURE ( oC) FIGURE 2. PEAK PULSE CURRENT TEST WAVEFORM 100 90 50 10 O1 T T1 T2 TIME O1 = Virtual Origin of Wave T = Time From 10% to 90% of Peak T1 = Virtual Front time = 1.25 • t T2 = Virtual Time to Half Value (Impulse Duration) Example: For an 8/20µs Current Waveform: 8µs = T1 = Virtual Front Time 20µs = T2 = Virtual Time to Half Value Transient V-I Characteristics Curve FIGURE 3. CLAMPING VOLTAGE FOR V131DA40, V131DB40 - V751DA40, V751DB40 200 6,000 5,000 4,000 3,000 1,000 900 800 700 600 500 400 300 10-2 10-1 100 101 102 103 104 105 MAXIMUM CLAMPING VOLTAGE DISC SIZE 40mm 130 TO 750 VM(AC) RATING TA = -55 oC to 85oC V421DA/DB40 V151DA/DB40 V751DA/DB40 PEAK AMPERES (A) V131DA/DB40 V321DA/DB40 V271DA/DB40 V251DA/DB40 V511DA/DB40 V481DA/DB40 V571DA/DB40 V661DA/DB40 2,000 |
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