Monolithic Power Systems Inc. EV6538-V-00A

Overview

EV6538-V-00A from Monolithic Power Systems is an evaluation board for the MP6538 three-phase BLDC motor pre-driver IC, supporting 8V–100V input operation, configured with six N-channel MOSFETs in three half-bridge stages, and designed for external MCU/FPGA-based commutation control using Hall sensor feedback from brushless motors.

For engineers reviewing the EV6538-V-00A datasheet, EV6538-V-00A pinout, EV6538-V-00A application, or EV6538-V-00A equivalent, this board enables rapid validation of MP6538-based motor drive topologies, OCP threshold tuning via OCR voltage, 100% duty cycle capability, fault signaling (FLT), and bootstrap gate drive (BSTx) implementation under real-world 100V bus conditions.

Technical Context

The EV6538-V-00A implements a discrete gate-drive interface for the MP6538 pre-driver IC, which requires external logic-level PWM inputs (PWMA/B/C), Hall position signals (U/V/W), and supplies VCC (3.3V/5V) and high-side bootstrap voltages (BSTA/B/C). It does not integrate motor control logic - all commutation sequencing is performed externally.

Board-level protection includes adjustable overcurrent protection (OCP) set by OCR reference voltage (0.125–2.4V), thermal shutdown (OTP), fault output (FLT), and TVS-protected 100V-rated input rail. Gate drive paths use low-inductance layout with dedicated bootstrap capacitors and 50mΩ current-sense resistors (R18–R20) for phase current monitoring.

Key Specifications

Availability

EV6538-V-00A is available at Aetrix Electronics and suitable for e-bike motor controller development, power tool drive validation, and industrial BLDC servo prototyping requiring stable component supply, repeatable test setup, and full-voltage stress verification up to 100V.

Supply support for EV6538-V-00A 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

Monolithic Power Systems (MPS) is a fabless semiconductor company specializing in high-performance analog and power ICs, with design centers across Asia and North America and global distribution infrastructure.

The MP6538 product line targets high-voltage, high-efficiency BLDC pre-driver applications where precise gate timing, robust fault response, and bootstrap reliability are critical - especially in cordless power tools and light electric vehicles.

FAQ

Does EV6538-V-00A include integrated MOSFETs?

No. The board hosts six external N-channel MOSFETs (Q2–Q7, AM7490N, 150V/8.3A) and is designed exclusively as an evaluation platform for the MP6538 pre-driver IC (U1), which provides only gate drive outputs - no power switching elements are integrated on-chip or on-board.

What external controller interfaces are supported?

The board accepts standard logic-level PWM inputs (PWMA/B/C), Hall sensor signals (U/V/W), enable lines (ENA/B/C), sleep control (SLP), and current sense output (CSO) via 2.54mm headers (P1, P2). All signals are 3.3V/5V tolerant and require no level-shifting when interfaced with common MCUs or FPGAs.

How is overcurrent protection calibrated?

OCP threshold is set by adjusting potentiometer R7 to deliver 0.125V–2.4V to the OCR pin of MP6538. With 50mΩ sense resistors, this corresponds to 0.25A–4.8A per phase. Trip response is hardware-based and latched until reset via SLP or power cycle.

Can the board operate without Hall sensors?

No. The MP6538 requires Hall sensor inputs (U/V/W) for commutation timing; the EV6538-V-00A has no sensorless BEMF detection circuitry. Hall signals must be provided by the motor or external sensor assembly and connected to P1 pins.

Is bootstrap capacitor charging supported for 100% duty cycle?

Yes. The board includes dedicated bootstrap capacitors (C2–C4, C12–C17) and diodes (D2–D7) for each high-side driver (BSTA/B/C), enabling sustained 100% duty cycle operation - verified per MP6538's internal charge-pump architecture and board layout.

What is the purpose of the FLT pin?

FLT is an open-drain, active-low fault indicator that asserts during overcurrent (OCP), overtemperature (OTP), or VIN undervoltage lockout. It connects directly to U1's FLT pin and is routed to P1 for system-level interrupt or status monitoring without additional conditioning.