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AN3271 Datasheet(PDF) 21 Page - STMicroelectronics

Part # AN3271
Description  This application note provides
PDF  29 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN3271 Datasheet(HTML) 21 Page - STMicroelectronics

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AN3271
VCC transient protection
Doc ID 17933 Rev 2
21/29
11
VCC transient protection
The absolute maximum supply voltage of the STM660x is 7 V. The immunity of high voltage
transients can be improved by using a Zener diode Z1 and current limiting resistor R1
(see Figure 19). The Zener diode does not draw any current within the operating VCC
voltage range (VCC specified from 1.6 V to 5.5 V).
A possible PMOS transistor can be protected by Zener diode Z2 similarly (see Figure 19).
The diode should have a breakdown voltage smaller than the PMOS gate-source
breakdown voltage.
Figure 19.
VCC transient protection



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