MOD-B9284/B6934/B6903: Three LCD Backlight Modules Complete Guide

This article consolidates the key specifications, pin definitions, functions, and usage guidelines of the MOD-B9284, MOD-B6934, and MOD-B6903 LCD backlight modules, helping you quickly understand and select the right solution.

All three modules are designed for LCD panel series LED backlight modules, featuring enable control and brightness adjustment. They also share the same LCD usage protection requirements, making them ideal for industrial displays and embedded systems. They differ in power supply range, driving capability, and dimming methods.

1. General Core Specifications (Same for All Three Backlight Modules)

All three modules include strict usage reminders for normally black LCD panels to prevent image retention (burn-in):

• Do not display static images for extended periods; refresh static screens every 2 minutes.
• Use pure black images or dynamic content for screensavers.
• Operating and storage temperature: -40℃ ~ +85℃, suitable for wide-temperature environments.

2. Core Electrical Parameters Comparison

Additional Notes:
MOD-B9284 has a default drive current of 60mA, with a recommended maximum of ≤300mA.
MOD-B6934 and MOD-B6903 feature wide-voltage input for higher power, supporting more series LED strings.

3. Pinout & Control Functions (Common Logic)

All three modules have similar pin layouts with consistent core functions:

• Power Pins: VIN (power input) and GND (ground) – the foundation for module operation.
• EN Enable Pin: Built-in pull-down resistor, default OFF. Requires a high-level signal to activate, acting as a master switch; low-level signal shuts down the module.
• Dimming Pin:
• MOD-B9284 supports both PWM signal and DC voltage dimming.
• MOD-B6934 and MOD-B6903 support only PWM dimming (frequency range: 100Hz~30kHz, recommended ≥25kHz to avoid flicker and noise).

4. Backlight Module Features & Selection Guide

• MOD-B9284: 5V standard power supply, supports both series and parallel connections. Ideal for low-power, small-size LCDs with flexible dimming options.
• MOD-B6934: 4.5~24V wide-voltage input, high power and high current. Best for high-voltage series LED backlights requiring maximum brightness.
• MOD-B6903: Wide-voltage input, medium power and current. Balanced performance, perfect for standard series LED backlights with excellent cost-effectiveness.

Summary

All three modules are professional series backlight modules with core EN enable + PWM dimming control. The universal anti-image retention guidelines ensure display lifespan.

Selection Tips:

• 5V low-power applications → Choose MOD-B9284
• Wide-voltage, medium-power applications → Choose MOD-B6903
• Wide-voltage, high-power applications → Choose MOD-B6934

These modules cover most LCD backlight driving scenarios.