Application information

ESDA18-1F2

4/8

2

Application information

One major point is that the ESDA18-1F2 has to ensure the safety during reverse battery

operation. Indeed, during this operation the device must clamp the DC reverse voltage

below 1.3 V @ 0.85 A (max current). Thus reverse battery operation has been simulated by

inverting the polatrity of the Transil (please see figures 8 and 9)

Figure 8.

Reverse battery operation setup

Figure 9.

Reverse battery operation results

A short calculation based on Reverse battery operation results figures clearly show that in

such real phone application the ESDA18-1F2 clamp the DC voltage below 1.3 V.

Typically the ESDA18-1F2 can clamp the DC voltage @ 0.9 V @ 0.76 A DC current:

PTC

1 nF

4.7 k

Ω

Equivalent

mobile phone

impedance

ESDA18-1F2

V

I

V

DC

2V

max

×

Π

-----------------------

21.4

×

3.14

-----------------

0.9V

≈≈

=

I

DC

2I

max

×

Π

---------------------

21.2

×

3.14

-----------------

0.76A

≈≈

=