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AN3399 Datasheet(PDF) 20 Page - STMicroelectronics

Part # AN3399
Description  L99PM62GXP external voltage regulation
PDF  24 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN3399 Datasheet(HTML) 20 Page - STMicroelectronics

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Evaluations of circuit with PNP and current limitation
AN3399
20/24
Doc ID 018824 Rev 2
2.2.4
VS cranking measurement
Screenshots of behavior in case of VS cranking pulse for various pulse widths are at the next
figures. In case VS reaches level for POR the V2 is switched off and as a consequence V3 is
switched off as well.
Figure 27.
VS cranking (1 ms pulse)
Figure 27 is a screenshot of VS cranking pulse 1 ms width. The VS under-voltage flag was
set in status register, but V2 remains ON.
Figure 28.
VS cranking (pulse 2 ms)
On Figure 28 VS reaches the level of power on reset. V2 was switched OFF and cold start
diagnosis bit was signalized in status registers.



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