LM3668SD-3034EV

Due to market price fluctuations, if you need to purchase or consult the price. You can contact us or emial to us:   sales@allicdata.com

Designers of high efficiency, high speed off-line switch mode power supplies (SMPS) are increasingly turning to innovative multi-phase synchronous buck controllers to improve the performance of their circuittopologies. Theis LM3668SD-3034EV is one such product. This evaluation board offers designers the opportunity to evaluate a fractional synchronous buck controller, and has proven to be an ideal platform for testing, enabling users to quickly explore the performance of the latest innovation in off-line SMPS controllers.

LM3668SD-3034EV Application Field

The LM3668SD-3034EV is intended for use in multi-phase synchronous buck modular SMPS in temperatures from -40°C to + 85°C. This versatile board can be used with multiple outputs in both fixed frequency and resonance frequency applications, features adjustable frequency and phase compensation, and operates in discontinuous mode or in continuous conduction. In addition, it has a wide output voltage range of 0.7 – 150V with output current capability up to 4A.

The board offers several protection features, including protection from overcurrent, thermal protection, OVP, skip start, and auto-start. The board also includes both a leading edge blanking and a trailing edge blanking to improve EMI performance. Further, the board has built-in short-circuit, overcurrent, overload, and overvoltage protection.

LM3668SD-3034EV Working Principle

The LM3668SD-3034EV follows a synchronous buck topology which is a DC-DC converter that uses a switching controller to regulate the output voltage. In a synchronous buck controller, the switches are arranged in a "bridge" formation, allowing the use of two switches rather than the traditional four switches per phase. This makes the circuit more energy efficient and eliminates the need for a number of bulky components.

The LM3668SD-3034EV employs a fractional synchronous buck controller, which is a variation on the traditional synchronous buck topology. In a fractional synchronous buck controller, the switches are only operated at the desired duty cycle, allowing the controller to reduce the input voltage by a factor of n/m. This technique results in higher efficiency due to the lower average current draw.

The LM3668SD-3034EV employs a pair of power MOSFETs for each of the two phases. The board has an on-board programming circuit to provide the proper control voltage to the gate driver IC. This circuit is powered by an adjustable DC/DC buck converter. The board also features a resistor-divider network to sense the output voltage, which is then used to regulate the output voltage.

Conclusion

The LM3668SD-3034EV is a fractional synchronous buck controller designed for use in multi-phase switch mode power supplies. It offers a wide range of features for the modern designer, including adjustable frequency and phase compensation, and protection from overcurrent, thermal protection, OVP, skip start, and auto-start. Additionally, the LM3668SD-3034EV offers energy efficient operation, and eliminates the need for bulky components. As such, it is an ideal platform for testing the latest innovation in off-line SMPS controllers.

The specific data is subject to PDF, and the above content is for reference