ESDA18-1F2(2005) View Datasheet(PDF) - STMicroelectronics
Part Name
Description
Manufacturer
ESDA18-1F2 Datasheet PDF : 7 Pages
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ESDA18-1F2
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 1.3V @ 0.85A (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
Vmains
PTC
Equivalent
mobile phone
impedance
I
V
4.7kΩ 1nF
Figure 9: Reverse battery operation results
ESDA18-1F2
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 1.3V.
Typically the ESDA18-1F2 can clamp the DC voltage @ 0.9V @0.76A DC current:
VDC=
-2----×-----V----m-----a---x
Π
≈
-2----×-----1---.--4--
3.14
≈
0.9
V
IDC=
2-----×-----I--m----a---x-
Π
≈
2-----×-----1----.-2--
3.14
≈
0.76
A
4/7
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