I was trying to understand the SG3525A (from ST-Micro) working. So I built a circuit as shown below. I read various articles on this chip, it mentions that to know whether its working or not, it can be checked using the Ct pin which would show the Sawtooth wave.
In this circuit, I have the following questions.
- The Vref pin is supposed to provide a 5V precision reference. Its not detectable in the oscilloscope. Is it normal?
What is the maximum input voltage that can be given to each pin.
- In many reference circuits I found that the compensation pin is connected with a series capacitor and a resistor and it is fed to the inverting input. Why is it done and how is the values of capacitor and resistor is selected?
- What is the work of the oscillator pin? Am I supposed to see square wave in the scope with the set frequency using RC?
Please help me out in finding the answers. Thank you!!