MP6538 BLDC Motor Pre-Driver QFN-28

MP6538 BLDC Motor Pre-Driver QFN-28

The MP6538 is a gate driver IC designed for three-phase, brushless DC motor driver applications.

Key Specifications

Features

• Supports 100V Operation
• Hall Sensor Inputs
• 120V VBST Maximum Voltage
• Internal LDO Supports External NPN for High-Current Drive Requirements
• Integrated Current-Sense Amplifier
• Low-Power Sleep Mode
• Programmable Over-Current Protection (OCP) of External MOSFETs
• Adjustable Dead-Time Control to Prevent Shoot-Through
• Thermal Shutdown and Under-Voltage Lockout (UVLO) Protection
• Fault Indication Output

Typical Application Circuit

Applications

• Three-Phase Brushless DC Motors and Permanent Magnet Synchronous Motors
• Power Drills

Design Notes

• Set dead time to match the external FET turn-off, not the datasheet typical. Too little risks shoot-through, too much distorts the current waveform at low duty cycle.
• Use a Kelvin connection for the current-sense resistor; shared copper injects switching noise straight into the sense amplifier.
• The thermal pad is the only heat path for most packages — via-stitch it to a ground plane with at least 9 vias.
• PWM frequency trades switching loss against current ripple in the motor inductance; 20 kHz keeps the drive out of the audible band.
• Add a brake or coast path so regeneration during a fast stop does not pump the supply rail.

Common Questions