LED driver power MOSFET selection, pay attention to parameters

What parameters should be considered when selecting LED driver power supplies that typically use MOS transistors as switching elements? Today, Youfeng Micro Editor will introduce the key parameters that need to be considered, and provide some commonly used LED driver power MOS model parameter tables for you to choose from.

Choosing a MOS transistor suitable for LED driving power supply requires consideration of rated voltage (Vds) and constant current (ld), Rds(on)， Switching speed, packaging type, etc., the following is a more detailed supplementary introduction.

1. Rated voltage (Vds): The rated voltage of MOSFET should be greater than or equal to the required driving power supply voltage. It is usually recommended to choose a rated voltage slightly higher than the actual voltage requirement to provide a certain margin.

2. Rated current (ld): The rated current of MOSFET should be greater than or equal to the required driving current to ensure that the selected MOSFET can withstand current loads and avoid overload.

3. Rds (on): This is the on resistance of MOSFET. A lower on resistance will result in lower power consumption and lower heat generation, thus providing higher efficiency. Choosing MOS transistors with low Rds (on values) can reduce power loss.

4. Switching speed: The switching speed of MOS transistors affects the switching frequency and efficiency of the power supply. For high-frequency applications, choosing MOSFETs with faster switching speeds can reduce switching losses.

5. Packaging type: Select the appropriate packaging type according to specific application requirements, such as T0-220, DPAK, D2PA, etc., to ensure that the selected MOS diode packaging can meet the heat dissipation requirements of power supply design

6. Reliability and Quality: Choose high-quality MOS transistors from reliable MOS manufacturers to ensure their performance stability and long lifespan.