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V131BA60 Datasheet(PDF) 3 Page - Littelfuse

Part No. V131BA60
Description  Varistor Products - High Energy Industrial
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Maker  LITTELFUSE [Littelfuse]
Homepage  http://www.littelfuse.com
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V131BA60 Datasheet(HTML) 3 Page - Littelfuse

   
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High Energy Industrial
BA/BB Varistor Series
Varistor Products
74
www .littelfuse .com
Power Dissipation Ratings
Should transients occur in rapid succession, the average power dissipation
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 Characteristics 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.
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 8/20
µs Current Waveform:
8
µs = T1 = Virtual Front Time
20
µs = T2 = Virtual Time to Half Value
FIGURE 3. STANDBY POWER DISSIPATION vs APPLIED
VRMS AT VARIED TEMPERATURES
TYPICALTEMPERATURE COEFFICIENT
OF POWER DISSIPATION = 2.2%/oC
MAX AT TA = 85
oC
MAX AT TA = 25
oC
TYP AT TA = 25
oC
1.0
0.8
0.6
0.4
0.2
0.1
0.08
0.06
0.04
80
90
100
110
PERCENTAGE OF MAXIMUM RATED V RMS (%)
FIGURE 4. TYPICAL STABILITYOF STANDBY POWER
DISSIPATION AT RATED V RMS vsTIME
1,000 HOURS, TA = 85
oC
0.5
0.4
0.3
0.2
0.1
0
0
10
100
1,000
TIME AT RATED V RMS (HOURS)
Typical Performance Curves
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