ESDA18-1F2 Ver la hoja de datos (PDF) - STMicroelectronics
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ESDA18-1F2 Datasheet PDF : 8 Pages
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Application information
2
Application information
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 1.3 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
Vmains
PTC
I
V
Equivalent
mobile phone
impedance
4.7 kΩ 1 nF
ESDA18-1F2
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:
VDC=
-2----×-----V----m-----a---x
Π
≈
2-----×-----1---.--4--
3.14
≈
0.9V
IDC=
2-----×-----I--m----a---x-
Π
≈
2-----×-----1---.--2--
3.14
≈
0.76A
4/8
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