TM1903 Single-Wire 3-Channel LED Constant Current Driver IC

TM1903 Single-Wire 3-Channel LED Constant Current Driver IC

The TM1903 is a single-wire, 3-channel constant current LED driver IC designed for LED decorative lighting applications. This IC offers an MCU-driven single-channel digital interface, data latching, constant current LED driving, and PWM brightness control, making it highly suitable for use in outdoor and indoor decorative lighting, LED strips, and point light sources. The TM1903 simplifies the design by requiring just a single wire for control, and its integrated 5V voltage regulator reduces the need for external components, making the system more efficient and cost-effective. The chip’s design ensures reliable and stable performance, offering precise current regulation and bright, smooth PWM-controlled lighting effects.

Key Features of TM1903:

• Power CMOS Technology: Built with power CMOS technology to ensure low power consumption, high efficiency, and reliable operation in LED lighting applications.
• 24V Output Voltage Tolerance: The output ports can handle up to 24V, providing flexibility for various LED types and configurations.
• Integrated 5V Voltage Regulator: The VDD pin has an integrated 5V voltage regulator, reducing the need for external voltage regulation and simplifying circuit design.
• Wide Voltage Range: The chip can operate with a working voltage range from 6V to 24V, giving it flexibility for different power supply configurations.
• Fixed 14mA Constant Current Output: The current output is fixed at 14mA, providing consistent and stable LED brightness across all channels.
• PWM Brightness Control: The PWM-based brightness control offers 256 levels of brightness adjustment, ensuring smooth lighting transitions and precise brightness control.
• Accurate Current Output:
  • Maximum error between channels: ±3%.
  • Maximum error between chips: ±5%. This ensures consistent LED performance and accurate color and brightness control.
• Single-Wire Serial Cascading Interface: The TM1903 features a single-wire interface, allowing data to be input via the DIN pin and cascaded to subsequent chips via the DO pin. The cascading functionality ensures that the signal will not be disrupted by a single chip failure, allowing for reliable large-scale installations.
• Internal RC Oscillator: The internal RC oscillator synchronizes data signals, ensuring that the data transmission remains distortion-free, even when cascading chips over long distances. This feature allows the IC to automatically regenerate and forward data without signal degradation.
• Power-On Reset Function: The built-in power-on reset function initializes all registers to zero, ensuring stable startup and eliminating the need for external reset circuits.
• Data Transfer Rate: The chip supports a data transfer rate of 800KHz, making it suitable for high-speed applications with large numbers of cascaded chips.
• Compact Packaging: Available in a SOP8 package, the TM1903 offers a space-efficient solution for integration into LED lighting systems.

Applications:

The TM1903 is ideal for a variety of LED lighting applications, including:

• Decorative LED Lighting: Perfect for use in LED point light sources, LED strips, and other decorative lighting products, creating vibrant and dynamic visual effects.
• Outdoor Lighting: Suitable for outdoor lighting systems, such as guardrail lights, where constant current and reliable performance are required.
• Signage and Display Lighting: Used in signage, advertisement boards, and LED displays where precise current control and consistent brightness are critical.
• Architectural and Event Lighting: Ideal for event lighting or architectural lighting, where cascading control and adjustable brightness are important for dynamic displays and effects.

Why Choose TM1903 for Your LED Lighting Projects?

The TM1903 provides an easy-to-integrate solution for creating high-quality LED lighting displays with single-wire control, precise constant current regulation, and PWM brightness adjustment. Its integrated voltage regulator and low component count make it cost-effective and simple to design into various lighting products. Whether you are creating outdoor decorative lighting, LED strips, or point light sources, the TM1903 offers consistent performance, easy scalability, and reliable operation for your lighting projects.