Three-Phase Motor Driver IC

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Design example

Three-Phase Motor Driver IC

Three integrated power half-bridges for externally controlled motor and solenoid drive, with current-limit control and fault-warning outputs.

Design targets

Power-stage configuration
Three integrated half-bridges
Power-stage voltage class
60 V; supply headroom and transients require evaluation
Logic supply
4.5–5.5 V (5 V nominal)
Continuous output current
8 A at 25 °C case temperature, subject to thermal limits
Peak output current
15 A class; pulse duration, duty cycle and thermal limits require validation
Control inputs
Six external pulse-width modulation (PWM) commands
Pin compatibility
44-pin signal-assignment compatibility target
Case-temperature range
−40 to +125 °C

Practical operating notes

  • Design is complete and pre-silicon. The listed specifications are design targets, not measured results. The 8 A continuous target assumes a 25 °C case; cooling, duty cycle and shared-package dissipation constrain operation. The 15 A peak-class target requires pulse and thermal validation.
  • The 60 V class does not establish safe operation on every 60 V supply rail. Evaluate voltage headroom, transients and undervoltage behavior. Controller signals must meet the logic-input thresholds.
  • An external controller supplies the PWM commands and motor commutation. System design must address inductive-energy paths, regeneration, supply bypassing and any required external diodes.
  • Current sensing covers forward current through the upper power transistors only; it does not measure all phase-current paths. Cycle-by-cycle limiting disables all three outputs when a sensed phase crosses the threshold. Input-edge reset behavior and the current-limit disable input require controller-level review.
  • Short-circuit and temperature outputs provide warnings rather than automatic shutdown. The controller or external circuitry must implement the required response.
  • Matching the 44-pin signal assignments is a compatibility target. Package variant, mechanical fit, thermal and electrical behavior, and board-level operation still require validation before interchangeability can be established.

Possible applications

  • Brushless DC (BLDC) motor windings
  • Brushed DC motor loads
  • Solenoid drive

Discuss your motor-driver requirements and compatibility constraints.

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