Communities

Writing
Writing
Codidact Meta
Codidact Meta
The Great Outdoors
The Great Outdoors
Photography & Video
Photography & Video
Scientific Speculation
Scientific Speculation
Cooking
Cooking
Electrical Engineering
Electrical Engineering
Judaism
Judaism
Languages & Linguistics
Languages & Linguistics
Software Development
Software Development
Mathematics
Mathematics
Christianity
Christianity
Code Golf
Code Golf
Music
Music
Physics
Physics
Linux Systems
Linux Systems
Power Users
Power Users
Tabletop RPGs
Tabletop RPGs
Community Proposals
Community Proposals
tag:snake search within a tag
answers:0 unanswered questions
user:xxxx search by author id
score:0.5 posts with 0.5+ score
"snake oil" exact phrase
votes:4 posts with 4+ votes
created:<1w created < 1 week ago
post_type:xxxx type of post
Search help
Notifications
Mark all as read See all your notifications »

Review Suggested Edit

You can't approve or reject suggested edits because you haven't yet earned the Edit Posts ability.

Approved.
This suggested edit was approved and applied to the post about 1 year ago by Nick Alexeev‭.

31 / 255
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 about 1 year ago by rdtsc‭