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| 型号： | TISP83121D-S |
| 厂商： | BOURNS INC |
| 元件分类： | 浪涌电流限制器 |
| 英文描述： | 22 A, SILICON SURGE PROTECTOR |
| 封装： | ROHS COMPLIANT, SOIC-8 |
| 文件页数： | 4/5页 |
| 文件大小： | 180K |
| 代理商： | TISP83121D-S |
FEBRUARY 1999 – REVISED JANUARY 2007
Specifications are subject to change without notice.
Customers should verify actual device performance in their specific applications.
APPLICATIONS INFORMATION
TISP83121D Unidirectional P & N-Gate Protector
Multiple Line Overvoltage Protection
Figure 2 shows two TISP83121D devices protecting many lines. Line conductor positive overvoltage protection is given by the steering diode
array connected to the anode of the upper TISP83121D and the TISP83121D itself. The TISP83121D gate reference voltage is the positive
battery supply, +VBAT. The initial limiting voltage will be the sum of the voltages of the battery, the forward biased conductor diode, the gate
trigger of the TISP83121D and the forward biased reference voltage blocking diode. Typically the conductor voltage will be initially limited at
2.5 V above the +VBAT value.
Figure 2. N Line Positive and Negative Overvoltage Protection
K
A
G1
TISP83121D
G2
K
A
G1
TISP83121D
G2
0
-VE
REFERENCE
VOLTAGE
AI8XAA
+VE
REFERENCE
VOLTAGE
LINE 1
IN
LINE N
IN
R1
T1
RN
TN
SLIC 1
SLIC N
R
+V
BAT
-V
BAT
Line conductor negative overvoltage protection is given by the diode steering array connected to the cathode of the lower TISP83121D and
the TISP83121D itself. The TISP83121D gate reference voltage is the negative battery supply, -VBAT. The initial limiting voltage will be the sum
of the voltages of the battery, the forward biased conductor diode, the gate trigger of the TISP83121D and the forward biased reference
voltage blocking diode. Typically the conductor voltage will be initially limited at 2.5 V below the -VBAT value.
When a TISP83121D crowbars and grounds all conductors of the appropriate polarity, the device current will be the sum of all the SLIC output
currents. This will usually exceed the TISP83121D holding current. To switch off the TISP83121D and restore normal operation, the grounded
condition of the SLIC output must be detected and the SLIC outputs turned off.
The 150 A rating of the TISP83121D allows a large number of lines to be protected against currents caused by lightning. For example, if a
recommendation K.20 10/700 generator was connected to all lines, together with 350 V primary protection and a series conductor resistance
(R) of 25 , the maximum conductor current before the primary protection operated would be 350/25 = 14 A or 28 A per line. For a total return
current of about 150 A the number of lines would be 150/28 = 5. At this current level, 5x28 = 140 A, the generator voltage would
be140((25+25)/10+15) = 2800 V. Another limitation is long term power cross. The long term power cross capability of the TISP83121D is 3 A
peak or 2.1 A rms. If the line conductor overcurrent protection was given by a PTC thermistor which tripped at 0.2 A, the maximum number of
conductors becomes 2.1/0.2 = 10 or 5 lines.
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