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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:

I am attaching the circuit diagram.

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.

enter image description here

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:

I am attaching the circuit diagram.

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?

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:

I am attaching the circuit diagram.

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.

enter image description here

Post Reopened by PeterJ, placeholder, markrages
Resize schematic and improve grammar etc
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PeterJ
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I want to implement a boost converter using a MC34063A. I have made the circuit as it is mentioned for step up-up operation in the MC34063A datasheet. The datasheet says it can take uptoup to 40V input. But I can see that the IC is getting burnt as soon as my input voltage exceeds 12V. What cancould be the reason? Here is a schematic of the circuit I'm using:

I am attaching the circuit diagram. Let me tell you all thatI am attaching the circuit diagram.

A 170uH was not available,that's that's why I used 100uH instead,Instead. Instead of a 0.22 ohmsohm resistor I used 0.5 ohm by paralleling two 1 ohmsohm resistors. Due to the unavailability of 1500 pfa 1500pF capacitor I used 1000pf1000pF.

The Schottky diode 1N5819 was not available in proteusProteus, that's why I have drawn the circuit with a 1N4148,but in practical but I am actually using a 1N5819 as suggested in the datasheet.Are Are these differences effectingaffecting the performance of the circuit?

I want to implement a boost converter using MC34063A. I have made the circuit as it is mentioned for step up operation in the MC34063A datasheet. The datasheet says it can take upto 40V input. But I can see that the IC is getting burnt as soon as my input voltage exceeds 12V. What can be the reason?

I am attaching the circuit diagram. Let me tell you all that 170uH was not available,that's why I used 100uH instead,Instead of 0.22 ohms I used 0.5 ohm by paralleling two 1 ohms. Due to the unavailability of 1500 pf I used 1000pf. Schottky diode 1N5819 was not in proteus, that's why I have drawn the circuit with 1N4148,but in practical I am using 1N5819 as suggested in the datasheet.Are these differences effecting the performance of the circuit?

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:

I am attaching the circuit diagram.

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?

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A.R
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I want to implement a boost converter using MC34063A. I have made the circuit exactly as it is mentioned for step up operation in the MC34063A datasheet. The datasheet says it can take upto 40V input. But I can see that the IC is getting burnt as soon as my input voltage exceeds 12V. What can be the reason?

I am attaching the circuit diagram. Let me tell you all that 170uH was not available,that's why I used 100uH instead,Instead of 0.22 ohms I used 0.5 ohm by paralleling two 1 ohms. Due to the unavailability of 1500 pf I used 1000pf. Schottky diode 1N5819 was not in proteus, that's why I have drawn the circuit with 1N4148,but in practical I am using 1N5819 as suggested in the datasheet.Are these differences effecting the performance of the circuit?

I want to implement a boost converter using MC34063A. I have made the circuit exactly as it is mentioned for step up operation in the MC34063A datasheet. The datasheet says it can take upto 40V input. But I can see that the IC is getting burnt as soon as my input voltage exceeds 12V. What can be the reason?

I want to implement a boost converter using MC34063A. I have made the circuit as it is mentioned for step up operation in the MC34063A datasheet. The datasheet says it can take upto 40V input. But I can see that the IC is getting burnt as soon as my input voltage exceeds 12V. What can be the reason?

I am attaching the circuit diagram. Let me tell you all that 170uH was not available,that's why I used 100uH instead,Instead of 0.22 ohms I used 0.5 ohm by paralleling two 1 ohms. Due to the unavailability of 1500 pf I used 1000pf. Schottky diode 1N5819 was not in proteus, that's why I have drawn the circuit with 1N4148,but in practical I am using 1N5819 as suggested in the datasheet.Are these differences effecting the performance of the circuit?

Post Closed as "Needs details or clarity" by Leon Heller, Anindo Ghosh, placeholder, PeterJ, Matt Young
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Nick Alexeev
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