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I have a voltage regulator circuit, which keeps failing. Its It is based around a switching regulator (datasheetswitching regulator) and. It takes 14V input from a variable voltage regulator (lab setup) and outputs 5V. I see 14V on the input but 0V on the output.

Interestingly after I soldered this I checked the pads of the IC for shorts and I did not find any, but after powering everything I turned off the power and checked again and there were many shorts. I replaced the IC, and the same thing happened again. So there There must be something wrong with the circuit?.

Particularly the voltage output to ground is showing just a few ohms.

edit1 IEdit 1:

I have replaced the IC now twice. Each time I measure no shorts from the Vout to ground. As soon as I power the circuit once though, I measure shorts after powering down. Just powered for a few seconds. What could be happening?

circuit

footprint

resistance check

I have a voltage regulator circuit, which keeps failing. Its based around a switching regulator (datasheet) and takes 14V input from a variable voltage regulator (lab setup) and outputs 5V. I see 14V on the input but 0V on the output.

Interestingly after I soldered this I checked the pads of the IC for shorts and I did not find any, but after powering everything I turned off the power and checked again and there were many shorts. I replaced the IC, and the same thing happened again. So there must be something wrong with the circuit?

Particularly the voltage output to ground is showing just a few ohms.

edit1 I have replaced the IC now twice. Each time I measure no shorts from the Vout to ground. As soon as I power the circuit once though I measure shorts after powering down. Just powered for a few seconds. What could be happening?

circuit

footprint

resistance check

I have a voltage regulator circuit which keeps failing. It is based around a switching regulator. It takes 14V input from a variable voltage regulator (lab setup) and outputs 5V. I see 14V on the input but 0V on the output.

Interestingly after I soldered this I checked the pads of the IC for shorts and I did not find any, but after powering everything I turned off the power and checked again and there were many shorts. I replaced the IC, and the same thing happened again. There must be something wrong with the circuit.

Particularly the voltage output to ground is showing just a few ohms.

Edit 1:

I have replaced the IC now twice. Each time I measure no shorts from the Vout to ground. As soon as I power the circuit once though, I measure shorts after powering down. Just powered for a few seconds. What could be happening?

circuit

footprint

resistance check

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Feynman137
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I have a voltage regulator circuit, which keeps failing. Its based around a switching regulator (datasheet) and takes 14V input from a variable voltage regulator (lab setup) and outputs 5V. I see 14V on the input but 0V on the output.

Interestingly after I soldered this I checked the pads of the IC for shorts and I did not find any, but after powering everything I turned off the power and checked again and there were many shorts. I replaced the IC, and the same thing happened again. So there must be something wrong with the circuit?

Particularly the voltage output to ground is showing just a few ohms.

edit1 I have replaced the IC now twice. Each time I measure no shorts from the Vout to ground. As soon as I power the circuit once though I measure shorts after powering down. Just powered for a few seconds. What could be happening?

circuit

footprint

resistance check

I have a voltage regulator circuit, which keeps failing. Its based around a switching regulator (datasheet) and takes 14V input from a variable voltage regulator (lab setup) and outputs 5V. I see 14V on the input but 0V on the output.

Interestingly after I soldered this I checked the pads of the IC for shorts and I did not find any, but after powering everything I turned off the power and checked again and there were many shorts. I replaced the IC, and the same thing happened again. So there must be something wrong with the circuit?

Particularly the voltage output to ground is showing just a few ohms.

circuit

footprint

resistance check

I have a voltage regulator circuit, which keeps failing. Its based around a switching regulator (datasheet) and takes 14V input from a variable voltage regulator (lab setup) and outputs 5V. I see 14V on the input but 0V on the output.

Interestingly after I soldered this I checked the pads of the IC for shorts and I did not find any, but after powering everything I turned off the power and checked again and there were many shorts. I replaced the IC, and the same thing happened again. So there must be something wrong with the circuit?

Particularly the voltage output to ground is showing just a few ohms.

edit1 I have replaced the IC now twice. Each time I measure no shorts from the Vout to ground. As soon as I power the circuit once though I measure shorts after powering down. Just powered for a few seconds. What could be happening?

circuit

footprint

resistance check

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Source Link
Feynman137
  • 1.3k
  • 1
  • 11
  • 38

I have a voltage regulator circuit, which keeps failing. Its based around a switching regulator (datasheet) and takes 14V input from a variable voltage regulator (lab setup) and outputs 5V. I see 14V on the input but 0V on the output.

Interestingly after I soldered this I checked the pads of the IC for shorts and I did not find any, but after powering everything I turned off the power and checked again and there were many shorts. I replaced the IC, and the same thing happened again. So there must be something wrong with the circuit?

Particularly the voltage output to ground is showing just a few ohms.

circuit

footprint

resistance check

I have a voltage regulator circuit, which keeps failing. Its based around a switching regulator (datasheet) and takes 14V input from a variable voltage regulator (lab setup) and outputs 5V. I see 14V on the input but 0V on the output.

Interestingly after I soldered this I checked the pads of the IC for shorts and I did not find any, but after powering everything I turned off the power and checked again and there were many shorts. I replaced the IC, and the same thing happened again. So there must be something wrong with the circuit?

Particularly the voltage output to ground is showing just a few ohms.

circuit

footprint

I have a voltage regulator circuit, which keeps failing. Its based around a switching regulator (datasheet) and takes 14V input from a variable voltage regulator (lab setup) and outputs 5V. I see 14V on the input but 0V on the output.

Interestingly after I soldered this I checked the pads of the IC for shorts and I did not find any, but after powering everything I turned off the power and checked again and there were many shorts. I replaced the IC, and the same thing happened again. So there must be something wrong with the circuit?

Particularly the voltage output to ground is showing just a few ohms.

circuit

footprint

resistance check

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Feynman137
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Feynman137
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