STMicroelectronics EVAL6227QR

Overview

EVAL6227QR from STMicroelectronics is an evaluation board for the L6227Q DMOS dual full-bridge motor driver IC, designed to validate bipolar stepper and dual/quad DC motor control implementations. It supports 8–52 V supply operation, delivers up to 2.8 A peak output current per bridge, integrates constant t_OFF PWM current controllers with external RC timing, and features non-dissipative overcurrent protection and thermal shutdown.

For engineers reviewing the EVAL6227QR datasheet, EVAL6227QR pinout, EVAL6227QR application, or EVAL6227QR equivalent, this board enables rapid functional validation of L6227Q-based motor drive topologies-including slow-decay synchronous rectification, cross-conduction prevention, and bootstrap gate drive-under real-world load, thermal, and PWM timing conditions.

Technical Context

The EVAL6227QR implements the full signal and power interface required to operate the L6227Q IC in its native VQFPN32 (5 mm × 5 mm) package, including dedicated bootstrap capacitor networks, RC timing components for independent bridge A/B PWM off-time configuration, and Kelvin-sense routing for accurate current regulation via external shunt resistors on both bridges.

It provides direct access to all 32 pins of the L6227Q-including ENA/ENB enable inputs with configurable R-C recovery networks, VREFA/VREFB analog reference inputs, RCA/RCB timing nodes, SENSEA/SENSEB current sense returns, and dual bridge outputs (OUT1A/OUT2A and OUT1B/OUT2B)-enabling full truth-table verification, dead-time measurement, and overcurrent fault response characterization.

Key Specifications

Availability

EVAL6227QR is available at Aetrix Electronics and suitable for motor control prototyping, stepper positioning systems, and dual DC actuator development requiring stable component supply, traceable evaluation hardware, and documented ST reference design compliance.

Supply support for EVAL6227QR 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 embedded processing solutions for industrial, automotive, and consumer applications.

The EVAL6227QR belongs to ST's official evaluation board portfolio for the L6227Q family-designed specifically to accelerate development of compact, high-efficiency dual-bridge motor drives for precision motion control and multi-axis actuation.

FAQ

What motor types can be evaluated with the EVAL6227QR?

The EVAL6227QR is configured to evaluate the L6227Q IC in bipolar stepper motor configurations (full-step, half-step, microstepping with external indexer) and dual or quad brushed DC motors. It supports bidirectional drive, brake modes, and slow-decay recirculation per bridge-validated per ST Application Note AN2912 and L6227Q datasheet Section 5.

Does the EVAL6227QR include onboard current sensing?

No-the EVAL6227QR provides dedicated solder pads and Kelvin routing for external low-value shunt resistors (e.g., 0.1 Ω) on both SENSEA and SENSEB paths, as required by the L6227Q's internal current comparator architecture. No onboard sense resistor is populated; users select value based on desired current limit and PCB thermal constraints.

How is bootstrap voltage generated on this board?

The EVAL6227QR implements ST-recommended charge pump circuitry: VCP oscillator output (pin 24) drives CP = 10 nF and D1/D2 (1N4148) diodes to charge CBOOT = 220 nF, delivering regulated ~10 V bootstrap voltage to VBOOT (pin 17) for high-side N-MOS gate drive-matching Figure 5 and Table 6 of the L6227Q datasheet.

Can the EVAL6227QR be used for closed-loop current regulation testing?

Yes-by applying precise reference voltages (0–5 V) to VREFA and VREFB (pins 26 and 15), configuring RC timing networks on RCA/RCB (pins 30 and 11), and monitoring SENSEA/SENSEB differential signals, users can characterize constant t_OFF PWM current regulation accuracy, blanking time (1 µs), minimum on-time (2.5 µs), and recirculation behavior under dynamic load.