STMicroelectronics EVAL6208N

Overview

EVAL6208N from STMicroelectronics is an evaluation board for the L6208 DMOS dual full-bridge stepper motor driver IC, designed to control bipolar stepper motors with peak current up to 5.6 A and supply voltage range 8–52 V. It implements non-dissipative overcurrent protection, dual independent constant t_OFF PWM current controllers, and supports full/half-step drive modes via integrated decoding logic.

For engineers reviewing the EVAL6208N datasheet, EVAL6208N pinout, EVAL6208N application, or EVAL6208N equivalent, this board enables rapid validation of L6208-based motor control designs - including thermal management under 2.8 A RMS load, fast/slow decay mode selection, and bootstrap charge-pump operation at up to 100 kHz switching frequency.

Technical Context

The EVAL6208N implements the complete reference circuit for the L6208 IC, including external components required for stable operation: 220 nF bootstrap capacitor (C_BOOT), 10 nF charge-pump capacitor (C_P), 100 Ω series resistor (R_P), and dual 1N4148 bootstrap diodes. It provides access to all critical signals - CLOCK, CW/CCW, HALF/FULL, CONTROL, EN, RESET, VREFA/VREFB, RCA/RCB, and SENSEA/SENSEB - enabling real-time tuning of PWM off-time and decay behavior.

Board-level design reflects L6208's PowerSO36 package thermal requirements: copper pour on bottom layer (6 cm²) connected to GND pins 1, 18, 19, 36 and internal slug, achieving R_th-j-amb ≈ 15 °C/W with 16 thermal vias and ground plane. The board supports both full-step (two-phase-on) and half-step excitation sequences generated internally by the L6208's phase sequence generator.

Key Specifications

Availability

EVAL6208N is available at Aetrix Electronics and suitable for industrial automation, CNC motion control, and precision medical equipment requiring stable component supply and validated motor driver reference designs.

Supply support for EVAL6208N 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 headquartered in Geneva, specializing in power management, motor control, and automotive-grade analog/mixed-signal ICs.

The EVAL6208N belongs to ST's dedicated motor control evaluation platform family, engineered to accelerate development of high-current bipolar stepper systems with minimal external component count and robust fault handling.

FAQ

Does EVAL6208N support both SO24 and PowerSO36 versions of the L6208?

No. EVAL6208N is specifically designed for the PowerSO36-packaged L6208, which features an exposed thermal slug connected to pins 1, 18, 19, and 36. The board's PCB layout, copper pour, and thermal via pattern are optimized for this package's heat dissipation path. It does not accommodate the SO24 variant due to differing pinout, footprint, and thermal interface requirements.

What external components must be populated to operate EVAL6208N with a 48 V, 2.5 A stepper motor?

Required components include: two 100 kΩ resistors (RCA, RCB) and two 1 nF capacitors (COFF-A, COFF-B) to set t_OFF ≈ 61 µs; 220 nF C_BOOT, 10 nF C_P, 100 Ω R_P, and two 1N4148 diodes for the charge pump; plus sense resistors (e.g., 0.1 Ω, 2 W) on SENSEA/SENSEB. All are documented in ST Application Note AN3277 and the EVAL6208N user manual.

Can EVAL6208N generate microstepping waveforms?

No. The L6208 IC - and thus EVAL6208N - only supports full-step (one- or two-phase-on) and half-step modes via its internal state machine. Microstepping requires external indexer or controller providing subdivided step pulses; the board lacks onboard current interpolation circuitry or digital microstep sequencer logic.

Is isolated power supply required for the logic and motor sections on EVAL6208N?

No. EVAL6208N uses a single-supply architecture where logic inputs (CLOCK, EN, etc.) operate at 5 V referenced to the same ground as the motor power stage. However, ST recommends using optocouplers or level shifters in final system designs to prevent noise coupling from high-current motor switching into sensitive control circuitry - a practice not implemented on the evaluation board itself.