TX6121

TX6121 is a high-efficiency, high-precision step-down high-power LED constant-current driver controller IC. The chip employs a peak current control method with fixed off-time, which can be adjusted via an external capacitor, allowing the operating frequency to be changed according to user requirements. By adjusting the external current sense resistor, the drive current of high-brightness LEDs can be controlled to achieve the desired constant brightness. Applying a PWM signal to the DIM pin enables LED dimming. The DIM pin also supports linear dimming. The chip integrates an internal VDD Zener regulator and over-temperature protection circuit, reducing external component count and improving system reliability. The chip is available in a SOT23-6 package.

Applications

• Network systems & medical devices
• Consumer electronics, bicycle/e-bike/motorcycle lighting
• High-intensity flashlights
• LED spotlights
• High-power LED lighting
• LED backlighting

Key features

• Input voltage: 3.6 - 100V
• Conversion efficiency: up to 93%
• PWM dimming and linear dimming support
• Maximum operating frequency: 1MHz
• CS voltage: 250mV
• VDD UVLO: 3.2V
• Adjustable off-time
• Intelligent over-temperature protection
• Built-in VDD Zener diode