TM1934: Single-Wire 3-Channel LED Constant Current Driver

TM1934: Single-Wire 3-Channel LED Constant Current Driver

The TM1934 is a specialized LED driver IC with three constant current output channels. It features a dual-channel digital interface (DIN, FDIN) for flexible input switching, enabling seamless cascading with other devices via the DO port. This IC integrates essential circuits such as an MCU-controlled single-wire dual-channel interface, data latches, constant current drivers, and 256-level PWM dimming control, making it ideal for LED decorative applications such as light tubes and point light sources. Its design emphasizes simplicity, reliability, and performance, requiring minimal external components.

Key Features

• Advanced CMOS Process
  • Power-efficient design with robust performance.
• High Voltage Tolerance
  • Output ports withstand up to 24V.
• Integrated Voltage Regulator
  • Built-in 5V regulator on the VDD pin, supporting input voltages from 6V to 24V with a series resistor.
• Constant Current Output
  • Fixed output current of 14mA per channel.
• Precise Current Control
  • Maximum error between channels: ±3%.
  • Maximum error between chips: ±5%.
• Flexible Interface Options
  • Single-wire, dual-channel serial cascading interface:
    • Switch between DIN and FDIN input modes.
    • DIN mode: Data input via DIN pin.
    • FDIN mode: Data input via FDIN pin.
    • DO pin transmits cascaded data to subsequent devices.
    • Malfunction of one chip does not affect others in the cascade.
• 256-Level Brightness Control
  • PWM dimming for precise brightness adjustments.
• Signal Integrity
  • Built-in RC oscillator with clock synchronization ensures no signal distortion or attenuation, even with long cascades.
• Power-On Reset Circuit
  • Resets all registers to zero upon startup for consistent initialization.
• High Data Transfer Speed
  • Supports data transmission rates up to 800KHz.
• Compact Packaging
  • Available in SOP8 package, simplifying integration in space-constrained designs.

Applications

The TM1934 is optimized for decorative LED lighting solutions, particularly in:

• Light Tubes (护栏管): Vibrant and dynamic linear lighting.
• Point Light Sources (点光源): Pixel lighting for decorative and architectural applications.

Specifications

Why Choose TM1934?

• Simplified Design: Single-wire dual-channel interface reduces complexity and enhances integration.
• High Precision: Low error rates ensure uniform lighting performance.
• Reliable Cascading: Maintains signal quality over long cascades with seamless data forwarding.
• Compact and Efficient: SOP8 package and minimal external components reduce space and cost requirements.

The TM1934 offers an excellent balance of functionality, performance, and reliability, making it a top choice for LED decorative applications.