STMicroelectronics STEVAL-ISA056V1

Overview

STEVAL-ISA056V1 from STMicroelectronics is an evaluation board based on the PM6600 IC, designed to demonstrate a 6-row, 30 mA constant-current LED backlight driver with integrated boost converter for LCD panel applications. It supports 4.5–28 V input, delivers up to 36 V boost output, provides ±2.0% current matching across rows, and enables PWM dimming down to 1% duty cycle at 20 kHz.

For engineers reviewing the STEVAL-ISA056V1 datasheet, STEVAL-ISA056V1 pinout, STEVAL-ISA056V1 application, or STEVAL-ISA056V1 equivalent, this board serves as a validated reference for LCD backlight power architecture, fault detection (open/short LED), thermal shutdown, and multi-device synchronization in industrial and consumer display systems.

Technical Context

The board implements a monolithic boost converter with internal 5 V LDO supply, peak-current-mode control, and programmable 200 kHz–1 MHz switching frequency. It integrates six independent current-sink channels, each adjustable up to 30 mA, with <500 ns minimum dimming pulse width and latched thermal shutdown.

LED fault detection logic monitors open-circuit and short-circuit conditions per row, while the SYNC pin enables phase-aligned operation across multiple boards. Programmable OVP, soft-start, and pulse-skipping mode at light load optimize efficiency and system stability.

Key Specifications

Availability

STEVAL-ISA056V1 is available at Aetrix Electronics and suitable for LCD backlight development, display module qualification, and LED driver IC validation requiring stable component supply, traceable sourcing, and legacy design support.

Supply support for STEVAL-ISA056V1 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 devices for industrial, automotive, and consumer markets.

The STEVAL-ISA056V1 belongs to ST's LED lighting evaluation platform family, developed specifically to accelerate adoption of high-efficiency, fault-resilient backlight architectures for TFT-LCD panels in industrial HMIs and commercial displays.

FAQ

What is the primary function of the STEVAL-ISA056V1 evaluation board?

The STEVAL-ISA056V1 is a complete reference design for evaluating the PM6600 LED backlight driver IC. It demonstrates a 6-channel, constant-current LED driver with integrated boost converter, supporting up to 30 mA per channel, precise current matching, PWM dimming, and comprehensive LED fault detection for LCD panel backlighting.

Does STEVAL-ISA056V1 support synchronization across multiple boards?

Yes - the board exposes the SYNC pin (U1 Pin 23) to enable external clock synchronization. This allows phase-aligned switching across multiple STEVAL-ISA056V1 units, reducing input ripple and EMI in multi-backlight systems such as large-format displays or dual-panel configurations.

Can unused LED rows be safely disabled on this board?

Yes - the board provides dedicated jumpers (SW1–SW3) and control signals to disable individual rows. When disabled, the corresponding current sink floats, eliminating leakage paths and preventing unintended current flow or thermal stress in unused segments of the LED array.

What protection features are implemented on STEVAL-ISA056V1?

The board implements OVP (programmable via OVSEL), overcurrent protection on the internal MOSFET, latched thermal shutdown, and per-row open/short LED fault detection. Fault events assert the FAULT pin (U1 Pin 22), enabling host MCU monitoring and fail-safe system response.