AN4209 datasheet(4/19 Pages) STMICROELECTRONICS

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)

j=25°C

j=85°C

j=125°C

BRmax

25°C

BRmax

85°C

BRmax

125°C

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