TM1925D: Six/Nine-Channel Fixed Constant Current LED Driver IC
The TM1925D is a specialized IC designed for six or nine channels of fixed constant current LED driving. It integrates an MCU-based single-wire digital interface, data latches, LED constant current drivers, and PWM brightness control circuits. The IC supports cascading through its single-wire digital interface (DI, DO), enabling external controllers to control multiple cascaded chips with just one signal wire. The PWM brightness of each output channel can be individually adjusted by an external controller. With an integrated 5V regulator at the VDD pin and minimal external components, the TM1925D is a reliable and efficient choice for various LED decorative applications.
Key Features
- Advanced CMOS Process
Ensures high performance and energy efficiency. - High Voltage Tolerance
Output ports (OUT) support up to 24V. - Fixed Constant Current Output
Provides a stable 17mA per channel. - Integrated 5V Regulator
Supports an input voltage range of 6V to 24V with an external series resistor. - PWM Brightness Control
- 256 levels of brightness adjustment for precise lighting control.
- Scanning frequency above 3KHz ensures flicker-free operation.
- Single-Wire Serial Cascade Interface
- Enables seamless cascading of multiple chips via DI and DO pins.
- Automatically regenerates and transmits signals to subsequent chips without distortion or attenuation, regardless of cascading distance.
- Reliable Signal Transmission
- Transmission distance of at least 30 meters between any two points.
- Supports a data transfer rate of up to 800Kbps.
- Power-On Reset Circuit
- Initializes registers upon startup.
- Default power-on setting: blue light with a 25% duty cycle.
- High Refresh Rate
- Supports up to 1024 cascading points at a refresh rate of 30 frames per second.
- Compact Packaging
- Available in SOP14 and DIP14 packages for flexible integration.
Applications
The TM1925D is ideal for a variety of LED decorative applications, including:
- Point Light Sources
Offers precise control for dynamic and vibrant lighting displays. - Light Bars and Tubes
Suitable for creating stunning architectural and decorative lighting effects. - Wall Wash Lights
Delivers consistent illumination for accent lighting and large-scale installations. - Flexible LED Strips
Enables customizable and energy-efficient strip lighting solutions.
Specifications
| Parameter | Value |
|---|---|
| Channels | 6 or 9 (configurable) |
| Output Current | Fixed at 17mA |
| Input Voltage Range | 6V–24V (with resistor) |
| Output Voltage Tolerance | Up to 24V |
| Brightness Levels | 256 (via PWM control) |
| Data Rate | 800Kbps |
| Cascade Distance | ≥30 meters between chips |
| Packaging | SOP14, DIP14 |
Why Choose TM1925D?
- Simplified Design: Reduces external components with integrated features like a 5V regulator and power-on reset.
- Precise and Reliable: Ensures consistent current output and seamless cascading for high-performance lighting applications.
- Versatile Applications: Designed for a wide range of decorative and architectural LED lighting needs.
- Durable and Efficient: Built to handle long transmission distances and high data rates with minimal signal loss.
The TM1925D delivers advanced functionality and reliable performance, making it an excellent choice for modern LED decorative lighting systems.
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