Good day. Need your help in our customer concern on CD74HC4050E. Please see below in verbatim.
"I was using the CD74HC4050E buffer IC in between with a 100 Hz 5Vpk-to-pk 2.5V offset and 1% duty cycle input signal and a Darlington system input pin. Since the buffer IC Vcc = 5V, I set a power supply for it. The input signal and power supply were sharing the common ground. In addition, there is a 50 ohm pulldown resistor connected the input signal before the signal went to the buffer IC input. I left the buffer IC output open (Not Connect) to verify the output signal. There is a 0.1 uF capacitor connected between buffer IC Vcc pin and GND pin.
The power supply output current remained 0 Amp when input signal was off. And drain some current after input signal was on.
What I didn't understand was, after I turned off the input signal, the power supply current increased and stayed there until I turned off the power supply output."
Here is the schematic.
Thanks and regards,