PT4115-MS

PT4115-MS is a continuous inductor current conduction mode buck LED constant current driver designed to drive one or multiple LED strings. Operating voltage ranges from 5.5V to 30V, providing adjustable output current with a maximum output current of up to 1A. Depending on the input voltage and external components, it can drive LEDs up to tens of watts. The device integrates a power switch, employs a high-side current sensing circuit, and features a DIM pin compatible with both PWM and analog dimming. When the DIM pin voltage falls below 0.3V, the output shuts down and enters standby mode. An integrated over-temperature protection circuit is included; when the chip reaches the over-temperature protection threshold, it enters over-temperature protection mode and the output current gradually decreases to improve system reliability. A patented circuit architecture ensures no output current overshoot during low dropout operation, extending LED operating life. The patented constant current circuit delivers excellent load regulation and line regulation. Available in SOT89-5 package.

Applications

• LED backup lights, signal lights
• Low-voltage LED spotlights replacing halogen lamps
• Automotive lighting

Key features

• Maximum output current: 1A
• High efficiency: 96%
• Excellent load and line regulation
• High-side current sensing
• Maximum dimming control frequency: 20KHz
• Hysteretic control, no loop compensation required
• Maximum operating frequency: 1MHz
• Current accuracy: ±3%
• Wide input voltage range: 5.5V~30V
• Intelligent over-temperature protection
• Low dropout with no overshoot