AN2689 datasheet(29/42 Pages) STMICROELECTRONICS

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AN2689

Supply rail protection

Doc ID 14310 Rev 3

29/42

Figure 39.

Package and internal schematic of the RBO40-40

Its specifications are the following:

4.5

Calculations for example 2

The voltage and current across the Transil are:

As with the previous example, the internal elements of the surge generator are not known.

So, the easiest way to proceed is to refer to the voltage and current curves of the generator.

With voltage and current curves produced from a SCHAFFNER NSG5500, LD5505 module,

(see Figure 40 and Figure 41), we can measure the duration tp which corresponds to the

duration between Ip and Ip/2

Table 7.

RBO40-40G electrical characteristics, Transil T2 (-40 °C < Tamb < +85 °C)

Symbol

Test conditions

Min.

Typ.

Max.

Unit

VBR 32

IR = 1 mA

VBR 32

IR = 1 mA, Tamb = 25°C

IRM 32

VRM = 20 V

100

µA

IRM 32

VRM = 20 V, Tamb = 25°C

µA

VCL 32

IPP = 20 A

(1)

One pulse

tp = 10/1000µs

T

Temperature coefficient of VBR

910-4/°C

C32

F = 1MHz VR = 0 V

8000

D2PAK

RBO40-40G

Ipp

Vbr

Vcl

max

Vbr

Ipp

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