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AN4071 Fiches technique(PDF) 20 Page - STMicroelectronics

No de pièce AN4071
Description  Introduction to comparators, their parameters and basic
PDF  27 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4071 Fiches technique(HTML) 20 Page - STMicroelectronics

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Hysteresis
AN4071
20/27
Doc ID 022939 Rev 1
Figure 23.
Device oscillation without CFB capacitor (green OUT, blue IN+), time scale
500 ns/div.
Applying a 22 pF feedback capacitor between the IN+ and OUT pin stops the oscillations, as
shown in Figure 24 and Figure 25. This feedback capacitor creates a peak (~150 mV for
20 ns) on the IN+ pin which securely eliminates the effects of the peak on VIN- coming from
Cparasitic. The feedback capacitor CFB implements a dynamic hysteresis.
Figure 24.
Case with CFB (green OUT, blue IN+), time scale 500 ns/div.



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