TILM3409HVMYX/NOPB
Overview
The LM3409HVMYX/NOPB is a high-side P-channel MOSFET controller for step-down LED drivers, designed to regulate constant current with a wide input voltage range of 6V to 75V. It utilizes a constant off-time control architecture that requires no external loop compensation, simplifying the design process while providing excellent transient response. The device is specifically engineered for high-brightness LED applications requiring precise dimming and high efficiency.
Why Choose This Part
The controller supports a massive 10,000:1 PWM dimming range and a 250:1 analog dimming range for superior brightness control. Its high-side differential current sensing allows the LED cathode to be connected directly to the chassis ground in automotive applications, reducing wiring complexity. Furthermore, the constant off-time architecture ensures the system remains stable without the need for complex control loop compensation components.
Applications
Key Specifications
Getting Started
Designers should begin by utilizing the TI WEBENCH Power Designer tool to calculate the necessary external P-channel MOSFET and inductor values based on the target LED string voltage. For physical evaluation, the LM3409EVAL evaluation board provides a reference layout that demonstrates proper thermal management of the 10-HVSSOP package. Ensure that high-frequency bypass capacitors are placed as close as possible to the VIN and VCC pins to minimize switching noise.
LM3409 Family
Comparing specs that differ across variants. The current part is highlighted.
| Part Number | Voltage - Supply (Max) | Stock |
|---|---|---|
| LM3409HVMYX/NOPB (this part) | 75V | 16,759 |
| LM3409MY/NOPB | 42V | 16,197 |
| LM3409HVMY/NOPB | 75V | 28,651 |
