LM3743MMX-300

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

Introduction

LM3743MMX-300 is a high frequency monolithic DC/DC controller IC designed to operate in Switching Mode Power Supply (SMPS). This integrated circuit supports up to 300V load with wide input voltage range and is capable of generating 0.5A output current. It is suitable for both high frequency and low frequency applications, even at temperatures as low as -40℃. In the field of DC/DC converters, LM3743 can be used to Monitor, Control, and Switch the output voltage of DC/DC converters. It is a highly reliable device designed with high integration, thus reducing cost and complexity of the design.

Application Field and Working Principle

The LM3743MMX-300 is an application-specific integrated circuit (ASIC) and it is used in step-down and flyback switch mode power supplies (SMPS). It is a low-voltage monolithic IC general-purpose controller designed to control the output voltage. It features a dynamic power management system, which helps maintain proper output voltage despite varying input voltage and load, making it suitable for all types of SMPS applications.

The nominal voltage is set using the internal feedback voltage threshold. When the output voltage falls below the nominal value, the LM3743MMX-300 will increase the duty cycle of the switching driver, thus increasing the output voltage. Conversely, when the output voltage is greater than the nominal value, the LM3743MMX-300 will reduce the duty cycle to reduce the output voltage. This feedback-loop control allows the output voltage to remain stable regardless of the load condition.

The LM3743MMX-300 has two working modes: voltage mode and current mode. In voltage mode, the duty cycle of the switching driver is determined by the actual output voltage, while in current mode, the duty cycle of the switching driver is determined by the output current. To further improve the performance of the LM3743MMX-300, the device supports PWM (pulse width modulation) mode which modulates the duty cycle according to the user specifications.

The LM3743MMX-300 also provides fault protection features such as power-on reset, over voltage protection, over current protection and open loop detection. The over voltage protection (OVP) will protect the device against output voltage exceeding the rated value. The over current protection (OCP) will protect the device from overloading and short circuit. The open loop detection will ensure that the output voltage is always in the proper operating range.

Conclusion

The LM3743MMX-300 is an integrated circuit designed to control a step-down switching mode power supply. It provides a wide range of voltage and current inputs, and is suitable for both high frequency and low frequency applications. The device includes a dynamic power management system to maintain a stable output voltage, as well as protection features such as PWM mode, over voltage protection, over current protection and open loop detection. Additionally, the device is cost effective and highly reliable.

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