Product Overview

PT4115 is a step-down constant current driver for LED lighting, adopting continuous inductor current conduction mode to drive one or multiple series-connected LEDs. With an input voltage range of 6-30V and adjustable output current up to 1.2A, it integrates a power switch and supports high-side current sampling. The DIM pin enables analog dimming and wide-range PWM dimming, with a standby current as low as 60μA, providing efficient and stable driving solutions for LED lighting systems.

Key Features

• Minimal External Components: Requires only a few external parts for circuit construction, greatly simplifying PCB layout and debugging to reduce material costs.
• Wide Input Voltage Range: Supports 6-30V input, compatible with various power sources for automotive, industrial, and civil applications.
• High Power Driving Capability: Delivers up to 1.2A output current, enabling driving of tens of watts LED loads with proper inductor selection.
• High-Precision Constant Current Control: Achieves ±5% output current accuracy with 1% precision sampling resistors, ensuring LED brightness consistency.
• Multiple Dimming Modes: Supports analog dimming (0.5-2.5V) and PWM dimming (100Hz-20kHz) via DIM pin, with a maximum dimming ratio of 5000:1 for versatile brightness adjustment.

Technical Specifications

Item	Parameters
Input Voltage Range	6-30V
Max. Output Current	1.2A
Current Sampling Voltage	100mV (Typ.)
Dimming Methods	Analog/PWM
Operating Frequency	Up to 1MHz
Conversion Efficiency	Up to 97%
Standby Current	60μA (DIM<0.3V)
Over-Temperature Protection	160℃ (Typ.), 20℃ hysteresis
Package Type	SOT89-5
Operating Temperature	-25℃~+85℃

Typical Applications

• LED Spotlight Replacement: Fits 1-3W low-voltage LED spotlights to replace traditional halogen lamps, achieving improved light efficiency and energy saving for home and commercial lighting.
• Automotive LED Lighting: Wide input voltage compatibility (6-30V) suits vehicle battery fluctuations, supporting PWM dimming for dashboard and headlight brightness control.
• Industrial Signal Indicators: Drives LED signal lamps and standby lights with stable current, featuring IP67-compliant periphery (with external circuits) for harsh industrial environments.
• Smart Lighting Control Systems: Integrates analog and PWM dimming interfaces for remote brightness adjustment in smart home systems, suitable for office buildings and hotels.
• Portable LED Devices: Low-power design with battery compatibility and soft start function to avoid inrush current, ideal for handheld searchlights and emergency lighting.

Why Choose PT4115?

• High-Performance Driving: 1.2A output current and 97% efficiency balance power capability and energy utilization, reducing system heat.
• Reliable Protection Features: Built-in over-temperature protection (160℃), under-voltage lockout (6.8V), and output short-circuit protection, compatible with IP67 periphery layout.
• Flexible Dimming Experience: Enables 0.02%-100% PWM dimming range with 5000:1 ratio at low frequency, supporting fine brightness adjustment from 微光 to full light.
• Low System Cost: Minimal external components (inductor, diode, capacitor) reduce PCB space and material costs, ideal for mass production.
• Wide Compatibility: Works with 6-30V inputs and LED types, supports direct MCU connection for intelligent control in diverse applications.

SUNTOP COMPANY INTRODUCTION

Founded in 2000, Suntop is one of the leading global distributors of electronic
components, dedica ted to providing comprehensive procurement and supply chain services to the global electronics manufacturing industry. Our services include distribution, spot trading, PPV cost-saving projects, and inventory management. We not only offer high-quality products but also strive to assist our clients in achieving optimal solutions with minimal time and cost.
As a trusted partner for numerous OEMs, ODMs, CEMs, and EMS companies worldwide, our professional team manages millions of component records from thousands of trading partners across dozens of countries daily through our company database. We maintain close business relationships with major factories and distributors in North America, Europe, and Asia to ensure that our clients stay ahead in a highly competitive market.