Content last revised on August 4, 2026
TDK CXA-0256 DC-AC Inverter Module for Industrial CCFL Backlights
Providing a stable 750 VRMS sinusoidal AC output from a wide 12 V DC input, this open-frame inverter drives four CCFL lamps efficiently. The TDK CXA-0256 is built with a 9.6V to 14.4V DC input voltage range, 850 mA supply current, and a 55 kHz sinusoidal frequency. It delivers a 10.2 VA power output with integrated DC-side fuse protection. How does the CXA-0256 handle input voltage fluctuations? It operates reliably across the 9.6V to 14.4V DC range, stabilizing the output voltage to prevent display flicker. For 12V industrial HMIs requiring four-lamp CCFL backlighting, the CXA-0256 is the optimal choice.
Application Scenarios & Value
Optimizing Quad-Lamp CCFL Backlight Systems in Industrial Control Panels
Engineers often face significant challenges when retrofitting or maintaining legacy industrial control panels, where input voltage drops on the primary 12V DC power line can cause display flickering or inverter shutdown. In high-vibration settings, maintaining a clean 750 VRMS AC supply is critical for keeping the backlight steady. The TDK CXA-0256 addresses these concerns by delivering consistent power to four separate CCFL tubes, ensuring uniform illumination across the entire panel area. Selecting a reliable inverter directly affects display life, which is a key factor when evaluating the total cost of ownership as discussed in the guide on industrial vs consumer displays.
This module is particularly suited for legacy HMIs in automotive test equipment, textile machinery, and medical monitoring systems. For complete display system designs, this inverter is compatible with industrial LCDs such as the LQ104V1LG61 or other four-lamp panels requiring stable high-voltage AC sources. While this inverter is ideal for driving quad-lamp panels, systems utilizing smaller dual-lamp displays such as the NL8060BC31-41C may require a different output configuration. If you are upgrading older systems to modern standards, you may also consider looking into the technical benefits of LED backlights for HMIs. However, for existing CCFL-based installations, the CXA-0256 provides a direct, drop-in electrical solution without needing a full panel redesign or rewiring of the display interface.
Technical Deep Dive
Analyzing the Sinusoidal AC Output and Electrical Topology
The electrical architecture of the TDK CXA-0256 (also referred to by its internal board designation, PCU-P063C) is optimized for high-efficiency, low-noise power conversion. Operating at a nominal input (Vin) of 12 V DC, it can swing between 9.6 V and 14.4 V DC, pulling a nominal supply current (Iin) of 850 mA. To understand the role of the sinusoidal inverter, think of it as a mechanical tuning fork. Just as a tuning fork must vibrate at a precise resonant frequency to produce a clear, sustained pitch without harsh mechanical stress, the CXA-0256 generates a smooth 55 kHz sine wave to drive CCFLs without creating damaging high-frequency electrical spikes that degrade the electrodes. What is the main output of the CXA-0256? A stable 750VRMS sinuslike AC voltage. How many CCFL lamps can the board drive? It is designed to power four lamps simultaneously.
Additionally, driving four separate CCFL lamps from a single module is like balancing a multi-way scale. The CXA-0256's multi-output structure ensures even current distribution of approximately 6 mA to each lamp, preventing brightness mismatch across the screen surface, much like a hydraulic manifold splits fluid pressure equally to multiple cylinders. This balanced loading prevents uneven wear on the CCFL cathodes, directly extending the panel's operational lifespan. Physically, the board measures 120 mm in length, 50 mm in width, and 8 mm in height, weighing approximately 30 g. Its open-frame design facilitates excellent convective cooling, though care must be taken in dust-prone environments to avoid electrical tracking on the high-voltage sections. A built-in fuse is integrated directly into the DC supply circuit to protect the host system from overcurrent conditions, though the high-voltage AC output side is left unfused to maintain maximum transmission efficiency.
Key Parameter Overview
Electrical and Mechanical Reference Data
| Parameter | Specification Value | Tolerance / Notes |
|---|---|---|
| Supply Voltage (Vin) | 9.6 V - 14.4 V DC (12V Nominal) | +/- 0.5 V DC |
| Supply Current (Iin) | 850 mA | +/- 30 mA |
| Working Voltage (Vout) | 750 VRMS | +/- 50 VRMS |
| Power Output | 10.2 VA | +/- 10% |
| Operating Frequency | 55 kHz Sinusoidal | +/- 5 kHz |
| Lamp Support | 4 CCFL lamps | Approx. 6mA per lamp |
| Dimensions (L x W x H) | 120 mm x 50 mm x 8 mm | L/W: +/- 0.5mm, H: +/- 1.0mm |
| Weight | 30 g | +/- 2 g (without cables) |
Download the CXA-0256 datasheet for detailed specifications and performance curves.
Frequently Asked Questions
Addressing Common Integration and Design Inquiries
How does the 9.6V to 14.4V supply voltage range benefit industrial setups?
It allows the inverter to operate normally even when the primary 12 V DC power rail fluctuates due to heavy inductive loads starting up elsewhere in the system, maintaining constant display brightness and preventing backlight shutdown.
Why is the 55 kHz operating frequency important for industrial display systems?
A nominal 55 kHz frequency keeps the backlight stable while minimizing electromagnetic interference (EMI) with neighboring telemetry and sensor circuits, preventing noise on screen interfaces.
Does the CXA-0256 include a built-in fuse?
Yes, the module is equipped with a safety fuse on the DC input circuit to prevent overcurrent propagation. However, the high-voltage AC output is unfused to maintain maximum power transfer to the lamps.
What are the physical dimensions and mounting requirements of the board?
The board dimensions are 120 mm x 50 mm x 8 mm. Since it has an open-frame design with no housing, it requires adequate physical clearance and ventilation to prevent thermal buildup and voltage arcing.
Can this module be used as a direct replacement for the PCU-P063C?
Yes, the CXA-0256 is the official model number for the PCU-P063C board layout, making it a drop-in replacement for systems utilizing that internal TDK part number.
For procurement inquiries or technical integration support, contact our sales team to check stock and request detailed pricing.