LM3743MM-300

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LM3743MM-300 is a high performance Pulse-Width Modulation (PWM) DC/DC switching regulator controller from Texas Instruments. The LM3743MM-300 provides variable switching frequency and precise ground-referenced current mode control for superior transient response and DC accuracy. It optimized for high voltage applications, such as automotive and other industrial applications requiring up to 30V input voltage.

LM3743MM-300 Application Field

The LM3743 is suitable for use in a variety of Buck, Boost, Buck-Boost, and negative boost applications. The device can also be used as a synchronous rectifier in Power Factor Correction (PFC) applications. It is also a great fit for 12V, 24V, and 48V battery or distributed power systems, Post Regulation, or Digital Motors Control. Additionally, the LM3743 can also be used for other automotive, industrial, and consumer applications.

LM3743MM-300 Working Principle

The LM3743MM-300 is a monolithic DC/DC switching regulator controller with an integrated high-side and low-side MOSFET drivers. It offers a wide range of features, including differential ground-referenced sense inputs, logic level handshaking, thermal shutdown, and system wide load sharing. The integrated driver stages provide a wide range of flexibility in the design of power converter circuits.

The LM3743’s Pulse-Width Modulation (PWM) is based on voltage-mode control. High-side gate drive is provided by an adjustable driver with a limited slew rate, while the low-side gate drive is provided by a fixed driver with limited slew rate. This ensures that the controller’s switching frequency is limited to a certain range. The controller also features an adjustable current limit to improve system responsiveness, and to prevent overloading.

The LM3743MM-300 offers a wide range of features, including programmable soft-start, under-voltage lockout, over-voltage protection, and thermal shutdown. The device operates from a single 5V main supply voltage, and features a precision bandgap reference and current-mode control loop with adjustable pulse-width modulation frequency.

The LM3743MM-300 also offers an integrated high-side and low-side driver stages with the flexibility of adjustable frequency and current limit. The high-side driver stage offers a high slew rate, while the low-side driver stage offers a low slew rate, allowing for improved transient response and accuracy. The adjustable frequency and current limit also allows for optimization of the power conversion circuit to suit the system requirements.

The LM3743MM-300 also features an integrated logic-level handshaking interface, allowing the system system to send and receive signals from different devices or systems. This interface can be used to signal the controller to enter into a sleep or normal operating mode, and also to signal the system when a fault has been detected.

Finally, the LM3743MM-300 also offers programmable soft-start, under-voltage lockout, over-voltage protection, and thermal shutdown. These features are designed to protect the system from potential damage caused by unexpected in-rush currents or voltage transients.

Conclusion

In conclusion, the LM3743MM-300 is a high performance, low cost, and compact Pulse-Width Modulation (PWM) switch controller. It offers a wide range of features, including differential ground-referenced sense inputs, logic level handshaking, adjustable frequency and current limit, and programmable soft-start, under-voltage lockout, over-voltage protection, and thermal shutdown. The LM3743MM-300 is optimized for a wide range of industrial, consumer and automotive applications, and provides an excellent solution for cost-sensitive and precision power conversion designs.

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