V131BA60 Datasheet, PDF (3/5 Pages) Littelfuse – Varistor Products - High Energy Industrial

Varistor Products
Industrial High Energy Terminal Varistors > BA/BB Series
Power Dissipation Ratings
Peak Pulse Current Test Waveform
100
90
80
70
60
50
40
30
20
10
0
-55 50 60 70 80 90 100 110 120 130 140 150
Figure 1
AMBIENTTEMPERATURE ( ^oC)
FIGURE 1. CURRENT, ENERGY AND POWER DERATING
Should transients ^Co^Uc^Rc^Vu^Er 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 the above diagram. 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.
Stand by Power Dissipation vs Applied V_Rms at Varied
Temperatures
TYPICAL TEMPERATURE COEFFICIENT
OF POWER DISSIPATION = 2.2%/^oC
1.0
0.8
MAX AT T_A = 85^oC
0.6
0.4
0.2
MAX AT T_A = 25^oC
0.1
0.08
TYP AT T_A = 25^oC
0.06
0.04
80
90
100
110
Figure 3
PERCENTAGE OF MAXIMUM RATED V _RMS (%)
FIGURE 3. STANDBY POWER DISSIPATION vs APPLIED
V_RMS AT VARIED TEMPERATURES
100
90
50
10
O₁
Figure 2
T
T₁
T₂
TIME
O₁ = Virtua
T = Time
T₁ = Virtua
T₂ = Virtua
Example: For
8 s = T₁ = V
20 s = T₂ = V
FIGURE 2. PEAK PULSE CURRENT TE
0₁ = Virtual Origin of Wave
T = Time from 10% to 90% of Peak
T₁ = Rise Time = 1.25 x T
T₂ = Decay Time
Example - For an 8/20 µs Current Waveform:
8µs = T₁ = Rise Time
20µs = T₂ = Decay Time
Typical Stability of Standby Power Dissipation at Rated
V_RMS vs Time
1,000 HOURS,T_A = 85^oC
0.5
0.4
0.3
0.2
0.1
0
0
Figure 4
10
100
TIME AT RATED V _RMS (HOURS)
1,000
FIGURE 4. TYPICAL STABILITYOF STANDBY POWER
DISSIPATION AT RATED V _RMS vsTIME
©2011 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/ba or /bb.html for current information.
Revision: September 25, 2011
BA/BB Varistor Series