This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

UC3625 problems

Other Parts Discussed in Thread: UC3625

Hi,

We have a design with a UC3625 to drive a BLCD motor.
we have some problems with the UC3625, hope someone can help.
The UC3625 gets controlled with an ATmega2560-16AU.
It involves the following problems:

1. In 4Q mode, the engine makes high frequency noise.
2. If the motor accelerates quickly, there's a lot of noise on our power supply (switching power supply 24Vdc, 7812, 7805). Even so much that the ATmega reboots.
3. With a few units a problem occurred after worked well for a while. The UC3625 stops driving one of the motor coils (U, V or W). It relates to both the high side and the low side.
The UC3625 stops switching at the PUA,PDA as example for the U coil.

As attachment I added schematics and a scoop images.

Does anyone have an idea what we can do about those problems?

Best regards.

7522.6761.Schematics.pdf

1346.2744.Scoop.pdf