I want to implement a boost converter using a MC34063A. I have made the circuit as it is mentioned for step-up operation in the MC34063A datasheet. The datasheet says it can take up to 40V input. But I can see that the IC is getting burnt as soon as my input voltage exceeds 12V. What could be the reason? Here is a schematic of the circuit I'm using:
A 170uH was not available, that's why I used 100uH instead. Instead of a 0.22 ohm resistor I used 0.5 ohm by paralleling two 1 ohm resistors. Due to the unavailability of a 1500pF capacitor I used 1000pF.
The Schottky diode 1N5819 was not available in Proteus, that's why I have drawn the circuit with a 1N4148, but I am actually using a 1N5819 as suggested in the datasheet. Are these differences affecting the performance of the circuit?
However,after reading a comment,below I have given the circuit using the original model or MC34063 in proteus.