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TISP7250H3SL 参数 Datasheet PDF下载

TISP7250H3SL图片预览
型号: TISP7250H3SL
PDF下载: 下载PDF文件 查看货源
内容描述: 三重双向晶闸管过电压保护 [TRIPLE BIDIRECTIONAL THYRISTOR OVERVOLTAGE PROTECTORS]
分类和应用:
文件页数/大小: 14 页 / 279 K
品牌: POINN [ POWER INNOVATIONS LTD ]
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TISP7070H3SL THRU TISP7095H3SL, TISP7125H3SL THRU TISP7210H3SL  
TISP7250H3SL THRU TISP7400H3SL  
TRIPLE BIDIRECTIONAL THYRISTOR OVERVOLTAGE PROTECTORS  
MARCH 1999 - REVISED MARCH 2000  
If the impulse generator current exceeds the protectors current rating then a series resistance can be used to  
reduce the current to the protectors rated value and so prevent possible failure. The required value of series  
resistance for a given waveform is given by the following calculations. First, the minimum total circuit  
impedance is found by dividing the impulse generators peak voltage by the protectors rated current. The  
impulse generators fictive impedance (generators peak voltage divided by peak short circuit current) is then  
subtracted from the minimum total circuit impedance to give the required value of series resistance. In some  
cases the equipment will require verification over a temperature range. By using the rated waveform values  
from Figure 10, the appropriate series resistor value can be calculated for ambient temperatures in the range  
of -40 °C to 85 °C.  
a.c. power testing  
The protector can withstand the G return currents applied for times not exceeding those shown in Figure 8.  
Currents that exceed these times must be terminated or reduced to avoid protector failure. Fuses, PTC  
(Positive Temperature Coefficient) resistors and fusible resistors are overcurrent protection devices which can  
be used to reduce the current flow. Protective fuses may range from a few hundred milliamperes to one  
ampere. In some cases it may be necessary to add some extra series resistance to prevent the fuse opening  
during impulse testing. The current versus time characteristic of the overcurrent protector must be below the  
line shown in Figure 8. In some cases there may be a further time limit imposed by the test standard (e.g. UL  
1459 wiring simulator failure).  
capacitance  
The protector characteristic off-state capacitance values are given for d.c. bias voltage, V , values of 0, -1 V,  
D
-2 V and -50 V. Where possible values are also given for -100 V. Values for other voltages may be calculated  
by multiplying the V = 0 capacitance value by the factor given in Figure 6. Up to 10 MHz the capacitance is  
D
essentially independent of frequency. Above 10 MHz the effective capacitance is strongly dependent on  
connection inductance. For example, a printed wiring (PW) trace of 10 cm could create a circuit resonance  
with the device capacitance in the region of 50 MHz. In many applications, the typical conductor bias voltages  
will be about -2 V and -50 V. Figure 7 shows the differential (line unbalance) capacitance caused by biasing  
one protector at -2 V and the other at -50 V.  
normal system voltage levels  
The protector should not clip or limit the voltages that occur in normal system operation. For unusual  
conditions, such as ringing without the line connected, some degree of clipping is permissible. Under this  
condition, about 10 V of clipping is normally possible without activating the ring trip circuit.  
Figure 9 allows the calculation of the protector V  
value at temperatures below 25 °C. The calculated value  
DRM  
should not be less than the maximum normal system voltages. The TISP3290H3, with a V  
of 220 V, can  
DRM  
be used for the protection of ring generators producing 105 V rms of ring on a battery voltage of -58 V. The  
peak ring voltage will be 58 + 1.414*105 = 206.5 V. However, this is the open circuit voltage and the  
connection of the line and its equipment will reduce the peak voltage.  
For the extreme case of an unconnected line, the temperature at which clipping begins can be calculated  
using the data from Figure 9. To possibly clip, the V  
value has to be 206.5 V. This is a reduction of the  
DRM  
220 V 25 °C V  
value by a factor of 206.5/220 = 0.94. Figure 9 shows that a 0.94 reduction will occur at an  
DRM  
ambient temperature of -32 °C. In this example, the TISP3290H3 will allow normal equipment operation, even  
on an open-circuit line, provided that the minimum expected ambient temperature does not fall below -32 °C.  
JESD51 thermal measurement method  
To standardise thermal measurements, the EIA (Electronic Industries Alliance) has created the JESD51  
3
3
standard. Part 2 of the standard (JESD51-2, 1995) describes the test environment. This is a 0.0283 m (1 ft )  
cube which contains the test PCB (Printed Circuit Board) horizontally mounted at the centre. Part 3 of the  
P R O D U C T  
I N F O R M A T I O N  
10