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AN4209 датащи(PDF) 4 Page - STMicroelectronics |
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AN4209 датащи(HTML) 4 Page - STMicroelectronics |
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4 / 19 page ![]() STRVS parameters AN4209 4/19 DocID023949 Rev 2 Clamping voltage (VCL) The clamping voltage is the total voltage across the STRVS over the peak pulse current IPP at a given temperature. A range of typical values provides the characteristics of the clamping voltage for given values of peak current (IPP), and three controlled junction temperatures: 25 °C, 85 °C and 125 °C. All curves start from VCL(1 mA) = VBRmax. Figure 2 illustrates VCL curves of an STRVS185X02B. These curves are useful for verifying the suitability of the allowable clamping voltage in application. Figure 2. Clamping voltage characteristic over temperatures of an STRVS185X02B 1.1.1 Simplified electrical model A linear model can be employed to approximate the VCL = f (IPP) characteristics of the STRVS. A straight line is used to approximate the actual curve inside the working area imposed by the application conditions (see Figure 3). The line intersects the horizontal axis at the voltage VCL0. The slope of the line is inversely proportional to the dynamic resistance RD. The equivalent circuit that models this equation is shown in Figure 4. 0.0 1.0 2.0 3.0 4.0 5.0 155 160 165 170 175 180 185 190 195 VCL (V) I(A) T j=25°C T j=85°C T j=125°C V BRmax 25°C V BRmax 85°C V BRmax 125°C 1m |
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