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AN4071 датащи(PDF) 20 Page - STMicroelectronics |
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AN4071 датащи(HTML) 20 Page - STMicroelectronics |
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20 / 27 page ![]() 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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