A3930KJPTR-T - Allegro Microsystems

A3930KJPTR-T Frequently Asked Questions (FAQs)

• What is the recommended PCB layout for the A3930KJPTR-T?
  The recommended PCB layout for the A3930KJPTR-T involves placing the device near the motor windings, using a solid ground plane, and keeping the high-current paths short and wide. A 4-layer PCB with a dedicated power plane is recommended.
• How do I choose the right sense resistor value for my application?
  The sense resistor value depends on the motor current and the desired current sense accuracy. A smaller sense resistor value provides higher accuracy but increases the power loss. A good starting point is to choose a sense resistor value that provides a voltage drop of around 50-100 mV at the maximum motor current.
• What is the maximum allowed voltage on the VBB pin?
  The maximum allowed voltage on the VBB pin is 35 V, but it's recommended to keep it below 30 V to ensure reliable operation and to prevent damage to the device.
• How do I handle the thermal shutdown feature?
  The thermal shutdown feature is activated when the device junction temperature exceeds 170°C. To handle this, ensure good heat sinking, reduce the power dissipation, or implement a thermal monitoring and shutdown circuit.
• What is the purpose of the EN pin, and how do I use it?
  The EN (enable) pin is used to enable or disable the device. When EN is high, the device is enabled, and when EN is low, the device is disabled. Use the EN pin to control the device's power state, especially in low-power or sleep modes.