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參數(shù)資料
| 型號(hào)： | V251BA60 |
| 廠商： | Littelfuse, Inc. |
| 元件分類： | 壓敏電阻 |
| 英文描述： | Varistor Products - High Energy Industrial |
| 中文描述： | 壓敏電阻器產(chǎn)品-高能源產(chǎn)業(yè) |
| 文件頁數(shù)： | 3/5頁 |
| 文件大小： | 212K |
| 代理商： | V251BA60 |
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
AMBIENT TEMPERATURE (
o
C)
80
90
100
110
120
130
140 150
P
FIGURE 2. PEAK PULSE CURRENT TEST WAVEFORM
100
90
50
10
O
1
T
T
1
T
2
TIME
P
O
1
= Virtual Origin of Wave
T = Time From 10% to 90% of Peak
T
1
= Virtual Front Time = 1.25
t
T
2
= Virtual Time to Half Value (Impulse Duration)
Example: For an 8/20
μ
s Current Waveform:
8
μ
s = T
1
= Virtual Front Time
20
μ
s = T
2
= Virtual Time to Half Value
FIGURE 3. STANDBY POWER DISSIPATION vs APPLIED
V
RMS
AT VARIED TEMPERATURES
TYPICAL TEMPERATURE COEFFICIENT
OF POWER DISSIPATION = 2.2%/
C
MAX AT T
A
= 85
o
C
MAX AT T
A
= 25
o
C
TYP AT T
A
= 25
o
C
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
(%)
P
O
R
FIGURE 4. TYPICAL STABILITY OF STANDBY POWER
DISSIPATION AT RATED V
RMS
vs TIME
1,000 HOURS, T
A
= 85
o
C
0.5
0.4
0.3
0.2
0.1
0
0
10
100
1,000
P
O
R
TIME AT RATED V
RMS
(HOURS)
Typical Performance Curves
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