TISP83121D 데이터 시트보기 (PDF) - Bourns, Inc

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TISP83121D

DUAL-GATE UNIDIRECTIONAL OVERVOLTAGE PROTECTOR

Bourns, Inc 

TISP83121D Unidirectional P & N-Gate Protector

APPLICATIONS INFORMATION

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.

R1

R

LINE 1

IN

R

T1

SLIC 1

A

G2

+VE

REFERENCE

VOLTAGE

+VBAT

G1

TISP83121D

R

K

A

0

R

G2

RN

R

LINE N

IN

R

TN

SLIC N

TISP83121D

G1

K

-VBAT

-VE

REFERENCE

VOLTAGE

AI8XAA

Figure 2. N Line Positive and Negative Overvoltage Protection

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 Ω, 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.

FEBRUARY 1999 – REVISED JULY 2008

Specifications are subject to change without notice.

Customers should verify actual device performance in their specific applications.

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