STMicroelectronics EVAL6227PD

Overview

EVAL6227PD from STMicroelectronics is an evaluation board for the L6227 DMOS dual full-bridge motor driver IC, designed to validate bipolar stepper and dual DC motor control in 8–52 V systems. It supports 2.8 A peak output current per bridge, features dual independent constant t_OFF PWM current controllers, slow-decay synchronous rectification, and non-dissipative overcurrent protection - enabling rapid prototyping of motion control subsystems in industrial automation and robotics.

For engineers reviewing the EVAL6227PD datasheet, EVAL6227PD pinout, EVAL6227PD application, or EVAL6227PD equivalent, this board provides verified reference layout, thermal management implementation, bootstrap charge pump tuning (VCP @ 600 kHz), and real-world validation of L6227's cross-conduction protection, thermal shutdown (T_j = 165 °C), and 1 µs deadtime timing.

Technical Context

The EVAL6227PD implements the full L6227 signal chain: dual H-bridge power stages with integrated fast freewheeling diodes, independent RC-network-tuned PWM current regulators (t_OFF programmable via ROFF/COFF), and ENA/ENB logic inputs tied to internal overcurrent/thermal fault transistors. It validates the bootstrapped high-side gate drive using VCP oscillator output (600 kHz typ.) and external 220 nF C_BOOT/10 nF C_P network.

Board-level design confirms critical timing behavior: 1 µs blanking time on SENSE pins prevents false triggering from diode reverse recovery spikes; minimum on-time (2.5 µs) and deadtime (0.5–1 µs) are preserved across load conditions; and synchronous rectification during slow decay mode is verified via OUTx voltage waveforms and current recirculation paths.

Key Specifications

Availability

EVAL6227PD is available at Aetrix Electronics and suitable for industrial motor control validation, robotics actuator development, and automated test equipment requiring stable component supply and production-ready reference designs.

Supply support for EVAL6227PD includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader specializing in power management, motor control, and industrial analog/mixed-signal solutions - with over 30 years of automotive- and industrial-grade reliability validation.

The EVAL6227PD belongs to ST's Motor Control Evaluation Platform family, engineered to accelerate adoption of their high-voltage, high-current DMOS drivers in precision motion applications where thermal robustness, current regulation accuracy, and fault resilience are critical.

FAQ

What power supply configuration is required for EVAL6227PD?

The board requires a single 8–52 V DC supply connected to VS terminals, with separate ground return paths for power and logic. Bootstrap capacitors (220 nF) must be installed on both VBOOT lines, and the charge pump oscillator (VCP) drives external 10 nF CP capacitors. No auxiliary supplies are needed - all logic and gate drive voltages are internally generated.

How is overcurrent protection implemented without external sense resistors?

EVAL6227PD demonstrates the L6227's integrated non-dissipative overcurrent detection: each high-side MOSFET includes a precision current mirror delivering ~1/1000 of output current to the EN pin. When sensed current exceeds 2.8 A, the EN pin is pulled low via an internal 4 mA open-drain transistor - triggering immediate bridge disable and enabling programmable recovery delay via external R_EN/C_EN.

Can EVAL6227PD support microstepping or only full/half-step modes?

EVAL6227PD supports full-step, half-step, and microstepping via external PWM modulation of the IN1/IN2 inputs and precise t_OFF tuning. The board's dual independent PWM controllers allow asymmetric current regulation per phase - enabling 1/4, 1/8, or 1/16 microstepping when paired with compatible step/dir controllers and appropriate RC timing components.

Does the board include provisions for thermal monitoring or heatsinking?

Yes - the EVAL6227PD exposes the L6227's exposed thermal slug (pins 1, 18, 19, 36 in PowerSO36) directly to a large internal copper pour connected to 16 thermal vias. A dedicated NTC footprint is provided near the IC for optional temperature feedback, and the PCB layout complies with ST's recommended 6 cm² dissipation area for R_th-j-amb ≤ 16 °C/W performance.