Overview
The Texas Instruments LM3414MRX/NOPB is a high-performance, 1-A, 60-W common anode-capable constant current buck LED driver. This device is designed to drive a single string of high-brightness LEDs (HBLEDs) with up to 96% efficiency. It accepts input voltages from 4.5 VDC to 42 VDC and delivers up to 1-A average LED current with ±3% accuracy. The LM3414MRX/NOPB integrates a low-side N-channel power MOSFET and current sensing element, eliminating the need for external current-sensing resistors and bootstrapping capacitors. This simplifies the circuitry and enhances overall efficiency. The device supports analog dimming, thermal fold-back, and constant switching frequency operation, which helps in reducing EMI issues.
Key Specifications
| Parameter | Description | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Input Voltage (Vin) | Input Voltage Range | 4.5 | - | 42 | V |
| Output Voltage (Vout) | Output Voltage Range | 0.2 | - | 42 | V |
| Output Current (Iout) | Maximum Output Current | - | - | 1 | A |
| Quiescent Current (Iq) | Typical Quiescent Current | - | 3.2 | - | mA |
| Switching Frequency | Adjustable Switching Frequency Range | 250 kHz | - | 1000 kHz | - |
| Operating Temperature Range | Operating Temperature Range | -40 | - | 125 | °C |
| Package | Package Type | - | - | HSOIC (DDA)-8 | - |
Key Features
- Supports LED power up to 60 W (e.g., 18x 3-W HBLEDs)
- No external current sensing resistor required
- ±3% LED current accuracy
- Up to 96% efficiency
- High contrast ratio with minimum dimming current pulse width <10 µS
- Integrated low-side N-channel MOSFET
- Adjustable constant LED current from 350 mA to 1000 mA
- Supports analog dimming and thermal fold-back
- Wide input voltage range: 4.5 V to 42 V (LM3414), 4.5 V to 65 V (LM3414HV)
- Constant switching frequency adjustable from 250 kHz to 1000 kHz
- Thermal shutdown protection
- Power enhanced SOIC-8 or 3 mm × 3 mm WSON-8 package
Applications
- High power LED drivers
- Architectural lighting, office troffers
- Automotive lighting
- MR-16 LED lamps
Q & A
- What is the input voltage range of the LM3414MRX/NOPB?
The input voltage range is from 4.5 VDC to 42 VDC for the LM3414 and up to 65 VDC for the LM3414HV.
- What is the maximum output current of the LM3414MRX/NOPB?
The maximum output current is up to 1 A.
- Does the LM3414MRX/NOPB require an external current sensing resistor?
No, it does not require an external current sensing resistor.
- What is the efficiency of the LM3414MRX/NOPB?
The device can achieve up to 96% efficiency.
- What are the available package types for the LM3414MRX/NOPB?
The device is available in SOIC-8 and 3 mm × 3 mm WSON-8 packages.
- Does the LM3414MRX/NOPB support analog dimming?
- What is the operating temperature range of the LM3414MRX/NOPB?
The operating temperature range is from -40°C to 125°C.
- Is thermal shutdown protection available in the LM3414MRX/NOPB?
- What is the typical quiescent current of the LM3414MRX/NOPB?
The typical quiescent current is 3.2 mA.
- Can the switching frequency be adjusted in the LM3414MRX/NOPB?
