2026-01-29 11:04 PM
Hello ST Community,
I am using HCF40106YM013TR in one of my products. One channel is configured with an RC timing network at the input, and its output is cascaded to another channel.
However, the output is chattering / oscillating near the positive trigger threshold voltage.
The RC values and operating conditions are as follows:
R = 500 KΩ
C = 4.7 µF
VCC = 14 V
GND is connected through a series diode for reverse polarity protection
The Schematic and output waveform also attached herewith FYR,
Wave form 1 : VCC (DSO channel 1) vs Capacitor charging (DSO channel 2).
Wave form 2 : Capacitor charging (DSO channel 1) vs HCF 10406 output (DSO channel 2)
Kindly suggest how to obtain a stable and smooth output and whether any changes in RC values, grounding, or protection scheme are required.
Thank you for your support.