STMicroelectronics EVAL6393FB

Overview

EVAL6393FB from STMicroelectronics is a low-voltage full-bridge demonstration board built around two L6393D half-bridge gate drivers, enabling bidirectional current control in single-phase loads. It supports up to 3.0 A RMS output current at 32–52 VDC bus voltage, features on-board V_CC generation, and offers configurable fast/slow-decay constant off-time peak current control for BLDC motors, fans, and HID lamps.

For engineers reviewing the EVAL6393FB datasheet, EVAL6393FB pinout (J1–J3, JP1–JP3), EVAL6393FB application in motor drive validation or power stage prototyping, or EVAL6393FB equivalent evaluation platforms, this board provides a validated, layout-optimized reference for full-bridge gate driver implementation with adjustable overcurrent threshold and decay mode selection.

Technical Context

The board implements a dual-L6393D full-bridge topology driving external N-channel MOSFETs (STD35NF06), supporting both PWM voltage-mode and constant off-time peak current control schemes. Control logic includes DIR, SD, BRAKE, and analog V_ctrl inputs routed via J1, with jumper-selectable signal sourcing (V_CC/CPOUT) and decay mode configuration.

On-board power management generates 12 V driver supply (V_CC) from the BUS voltage using Zener-based regulation (DZ2, R29); external V_CC injection is supported via J1 when JP3 is opened. Peak current sensing uses parallel 0.15 Ω shunts (R10–R13) feeding the L6393's CP− input, with TR2 adjusting I_pk threshold and TR1 setting off-time duration.

Key Specifications

Availability

EVAL6393FB is available at Aetrix Electronics and suitable for BLDC motor control validation, HID lamp ballast prototyping, and fan speed regulation systems requiring stable component supply and reference-grade gate driver implementation.

Supply support for EVAL6393FB 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, Switzerland, designing and manufacturing microcontrollers, power ICs, sensors, and analog/mixed-signal products for industrial, automotive, and consumer applications.

The EVAL6393FB belongs to ST's motor control evaluation platform family, engineered specifically to accelerate development of high-efficiency, compact full-bridge power stages using advanced gate drivers like the L6393D.

FAQ

What load types are validated for use with EVAL6393FB?

The board is validated for single-phase brushless DC (BLDC) motors, centrifugal fans, and high-intensity discharge (HID) lamps. These loads were selected based on their compatibility with the 3.0 A RMS current rating, 32–52 V bus range, and fast/slow-decay control modes implemented on the board.

Can EVAL6393FB operate above 52 V bus voltage?

Yes - the maximum bus voltage can be extended to 580 V by replacing C15 (bulk capacitor) and Q1–Q5 (MOSFETs) with higher-voltage-rated components, removing R29, and supplying V_CC externally through J1 with JP3 open, as documented in Table 1 footnote 2.

How is overcurrent protection configured on this board?

Overcurrent protection is implemented via the L6393D's internal comparator using a parallel 0.15 Ω shunt network (R10–R13) across the low-side MOSFETs. The trip threshold is adjusted by TR2 (500 Ω trimmer), and response timing is set by TR1 (200 kΩ trimmer) controlling constant off-time duration after detection.

What is the function of JP3 on the EVAL6393FB board?

JP3 connects the on-board 12 V V_CC rail (generated from BUS voltage via DZ2/R29) to the V_CC pins of the L6393D drivers. Opening JP3 isolates this supply, allowing external 10–20 V V_CC to be injected through pin 1 of J1 - essential for high-voltage bus operation or noise-sensitive applications.