Overview
The LM3414MR/NOPB, produced by Texas Instruments, is a high-power floating buck LED driver designed for a wide range of lighting applications. This device is part of the LM3414 and LM3414HV family, which offers robust and efficient solutions for driving high-power LEDs. The LM3414MR/NOPB features a proprietary Pulse-Level-Modulation (PLM) control method, ensuring high conversion efficiency and accurate average LED current regulation without the need for external current sensing elements or loop compensation networks.
The device is available in SOIC-8 and 3 mm × 3 mm WSON-8 packages, providing flexibility in design and thermal management. It supports a wide input voltage range of 4.5 V to 42 V, making it suitable for various power supply conditions.
Key Specifications
| Parameter | Min | Max | Unit | |
|---|---|---|---|---|
| Input Voltage Range | 4.5 | - | 42 | V |
| Switching Frequency | 250 | 500 | 1000 | kHz |
| Average LED Current | 0.95 | 1 | 1.05 | A |
| Minimum ON Time | 400 | - | - | ns |
| Thermal Shutdown Temperature | - | - | 170 | °C |
| Operating Current (DIM High) | 2.2 | 3.2 | 3.5 | mA |
| Standby Current (DIM Low) | 0.8 | 1.15 | 1.4 | mA |
Key Features
- Pulse-Level-Modulation (PLM) Control: Ensures accurate average LED current regulation without direct output current sensing, reducing power losses and increasing efficiency.
- High-Speed Dimming: Supports high-resolution brightness control with a minimum ON time of 400 ns, enabling fine dimming adjustments.
- Wide Input Voltage Range: Operates from 4.5 V to 42 V, making it versatile for various power supply conditions.
- Adjustable Switching Frequency: Can be set from 250 kHz to 1000 kHz using an external resistor.
- Thermal Shutdown Protection: Prevents overheating by shutting down the device when the junction temperature exceeds 170°C.
- Internal VCC Regulator: Provides a 5.4-V internal voltage regulator for powering internal circuitry and external components.
- No External Current Sensing Elements Needed: Simplifies the design by eliminating the need for external current sensing resistors and loop compensation networks.
Applications
- High Power LED Drivers: Suitable for driving high-power LED arrays in various lighting applications.
- Architectural Lighting: Ideal for office troffers and other architectural lighting solutions.
- Automotive Lighting: Can be used in automotive lighting systems due to its robust and efficient design.
- MR-16 LED Lamps: Applicable in MR-16 LED lamp designs where high efficiency and precise current regulation are required.
Q & A
- What is the input voltage range of the LM3414MR/NOPB?
The input voltage range is from 4.5 V to 42 V.
- What is the switching frequency range of the LM3414MR/NOPB?
The switching frequency can be adjusted from 250 kHz to 1000 kHz.
- What is the average LED current range of the LM3414MR/NOPB?
The average LED current range is from 0.95 A to 1.05 A.
- Does the LM3414MR/NOPB require external current sensing elements?
No, it does not require external current sensing elements due to its proprietary PLM control method.
- What is the thermal shutdown temperature of the LM3414MR/NOPB?
The thermal shutdown temperature is 170°C.
- How is the switching frequency adjusted on the LM3414MR/NOPB?
The switching frequency is adjusted using an external resistor connected to the FS pin.
- What is the purpose of the internal VCC regulator in the LM3414MR/NOPB?
The internal VCC regulator provides a 5.4-V voltage for powering internal circuitry and external components.
- Can the LM3414MR/NOPB be used in automotive lighting applications?
- What is the minimum ON time of the LM3414MR/NOPB?
The minimum ON time is 400 ns.
- How does the PLM control method improve efficiency in the LM3414MR/NOPB?
The PLM control method reduces power losses by sensing the current of the internal switch only during the ON period, thus increasing efficiency.
