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Product Detailed Parameters
- Description：IC LED DRIVER LINEAR PWM 28SOIC
- Series：-
- Mfr：onsemi
- Package：Tape & Reel (TR),Cut Tape (CT)
- Type：Linear
- Topology：-
- Internal Switch(s)：No
- Number of Outputs：4
- Voltage - Supply (Min)：10.5V
- Voltage - Supply (Max)：35V
- Voltage - Output：-
- Current - Output / Channel：-
- Frequency：-
- Dimming：PWM
- Applications：Backlight
- Operating Temperature：-40°C ~ 125°C (TA)
- Mounting Type：Surface Mount
- Package / Case：28-SOIC (0.295", 7.50mm Width)
- Supplier Device Package：28-SOIC
- Grade：-
- Qualification：-
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Overview
The FAN7346MX is a 4-channel LED current balance controller designed for edge-type LCD backlight units and general LED lighting applications. It maintains equal current across four LED arrays using linear balance control with a wide LED string voltage range of up to 100V. The device operates with a VCC supply between 10.5V and 35V and features an internal voltage regulator for feedback monitoring. Key electrical characteristics include precision current accuracy trimmed to 1.5% and support for external PWM dimming with a ratio from 0.5% to 100%. It generates an integrated feedback signal combining current feedback and PWM dimming for primary side direct feedback, enhancing efficiency.
Feature Summary
- Linear balance control for maintaining equal current in 4-channel LED arrays
- Generates integrated feedback signal combining current feedback and PWM dimming for primary side regulation
- Supports external PWM dimming with a wide dimming ratio capability
- Includes comprehensive protection mechanisms such as thermal shutdown, over-voltage regulation, and channel-specific open/short-LED protection
Applications
- LCD TV edge-type LED backlight units
- LCD monitor backlight systems
- General LED lighting fixtures
Procurement Notes
Verify the specific suffix against official onsemi documentation to confirm package type and tape/reel specifications. Ensure compatibility with the target LED string voltage and input supply range. Confirm that the integrated feedback signal generation aligns with the primary controller requirements of the design. Check for any recent obsolescence notices or pinout changes associated with the Fairchild integration.
Selection Notes
Select this component when designing edge-lit LCD backlights requiring precise current matching across multiple channels. It is suitable for applications needing high efficiency through primary side regulation without secondary sensing components. Consider the 100V LED string voltage limit and the 10.5V to 35V VCC range during circuit planning. The integrated feedback feature simplifies the transformer design in flyback converters.
Part Context
The FAN7346MX belongs to the FAN7346 series of LED controllers manufactured by onsemi, formerly Fairchild Semiconductor. This series is engineered for high-performance LED driving where current balance is critical for uniform brightness. The device integrates advanced features like adaptive linear regulation and error flag output to facilitate robust system design in consumer electronics and lighting markets.
Replacement Considerations
Consult official cross-reference lists for verified substitutes. Ensure any replacement supports 4-channel linear balance and similar voltage ranges. Verify pin compatibility if substituting directly into existing PCB layouts.
