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This suggested edit was approved and applied to the post 8 months ago by Nick Alexeev‭.

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Burned Source Driver - Noise Spikes from Relay Coil
  • I am trying to figure out what is causing an Allegro A2982 source driver to burn up.
  • The source driver (A2982) is connected to the coil of a Panasonic TXS2-9V relay. The source driver and coil are connected by about 3 feet of wire. The source driver is on the high side and the coil is on the low side.
  • The rail of the source driver (Vs) is 9 V. The source driver output is ~7.4 V. The peak voltage of the spike, measured across the inductor, is ~13.2 V. Note: I am using a differential probe to measure the voltage across the coil.
  • ![Image_alt_text](https://electrical.codidact.com/uploads/vqtgn1dxdkpk6uc4alv7wmd852lm)
  • Is it a valid concern that:
  • 1. This voltage spike is causing damage to the source driver?
  • 2. The 9V supply may see the voltage spike and cause damage?
  • 3. The Vbe reverse breakdown voltage of the darlington-pair may be exceeded and cause damage?
  • If the spike is causing damage, is there a way to reduce or mitigate the spike?
  • I am trying to figure out what is causing an [Allegro A2982 source driver](https://www.allegromicro.com/~/media/Files/Datasheets/A2981-2-Datasheet.ashx) to burn up.
  • The source driver (A2982) is connected to the coil of a Panasonic TXS2-9V relay. The source driver and coil are connected by about 3 feet of wire. The source driver is on the high side and the coil is on the low side.
  • The rail of the source driver (Vs) is 9 V. The source driver output is ~7.4 V. The peak voltage of the spike, measured across the inductor, is ~13.2 V. Note: I am using a differential probe to measure the voltage across the coil.
  • ![Waveform](https://electrical.codidact.com/uploads/vqtgn1dxdkpk6uc4alv7wmd852lm)
  • Is it a valid concern that:
  • 1. This voltage spike is causing damage to the source driver?
  • 2. The 9V supply may see the voltage spike and cause damage?
  • 3. The Vbe reverse breakdown voltage of the darlington-pair may be exceeded and cause damage?
  • If the spike is causing damage, is there a way to reduce or mitigate the spike?

Suggested 8 months ago by rdtsc‭