The LM3481-Q1 device is a versatile Low-Side N-FET high-performance controller for switching regulators. The device is designed for use in boost, SEPIC and flyback converters and topologies requiring a low-side FET as the primary switch. The LM3481-Q1 device can be operated at very high switching frequencies to reduce the overall solution size. The switching frequency of the LM3481-Q1 device can be adjusted to any value between 100 kHz and 1 MHz by using a single external resistor or by synchronizing it to an external clock. Current mode control provides superior bandwidth and transient response in addition to cycle-by-cycle current limiting. Current limit can be programmed with a single external resistor.
The LM3481-Q1 device has built-in protection features such as thermal shutdown, short-circuit protection and overvoltage protection. Power-saving shutdown mode reduces the total supply current to 5 µA and allows power supply sequencing. Internal soft start limits the inrush current at start-up. Integrated current slope compensation simplifies the design and, if needed for specific applications, can be increased using a single resistor.
| Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | LM3481-Q1 High-Efficiency Controller for Boost, SEPIC and Flyback DC/DC Converters datasheet (Rev. B) | PDF | HTML | 09 Dec 2024 |
| Technical article | Create a 24W power supply for automotive LED lighting systems | PDF | HTML | 14 Oct 2016 | |
| EVM User's guide | LM3481 flyback EVM User's Guide | 19 May 2016 | ||
| EVM User's guide | AN-1756 LM3481 Evaluation Board (Rev. A) | 01 May 2013 | ||
| User guide | AN-2094 LM3481 SEPIC Evaluation Board (Rev. A) | 25 Apr 2013 | ||
| User guide | 330mW AC or DC Tiny Flyback Converter Power Supply Reference Design User Guide | 27 Jan 2012 |
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The LM3481 is a current mode, low side N channel FET controller. It can be utilized in numerous configurations including a Boost, Flyback or SEPIC (Single Ended Primary Inductor Converter). This evaluation board demonstrates the flexibility of the LM3481 in a boost topology providing 12 volt output (...)
The LM3481 SEPIC evaluation board is designed to provide the design engineer with a fully functional power converter solution with two output voltage options. It produces a selectable output voltage of 12 V at 1.25A or 5V at 3A. The switching frequency for the converter is set to 500 kHz. The (...)
This tool helps a power supply engineer to select the right isolated DC-DC topology based on the specifications. Depending on the topology chosen, the calculator also recommends the right IC for the design.
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| VSSOP (DGS) | 10 | Ultra Librarian |
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The LM3481 quick start calculator for Flyback topology supports the initial calculation of the power stage and of the necessary external components for a Flyback converter using LM3481 as regulation IC.
The LM3481 Quickstart Calculator for Boost tool supports the initial calculation of the boost power stage and of the necessary external components for a boost converter using LM3481 as regulation IC.
Initial version
The LM3481 quick start calculator for SEPIC tool supports the initial calculation of the SEPIC power stage and of the necessary external components for a SEPIC converter using LM3481 as regulation IC.