LM3351MMX/NOPB

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Introduction

The LM3351MMX/NOPB is a family of DC-DC switching regulators used for regulating voltages during applications such as maximum power point tracking (MPPT) and dynamicbus voltage conversion from a higher to lower level. This regulator uses average current mode control and is specifically designed to facilitate programmable Power-Voltage Regulation (PVR) for solar PV applications and for other applications where dynamic bus voltage regulation is required.

Features

• Wide input voltage range from 4.75V to 60V
• Adjustable switching frequency up to 2MHz
• Programmable output voltage up to 28V
• High switching frequencies allow for small external components
• Programmable current-limited capability to protect external components
• High differential input voltage capability up to 100V
• High efficiency up to 95%
• Shutdown mode allows system power-up sequencing
• Increased power and system reliability with internal under-voltage and over-voltage protection
• Pulse-by-pulse current limiting
• Adjustable slope compensation for noise-free regulation
• Adjustable frequency for EMI reduction
• Integrated over temperature protection
• Low power-up surge current
• Low on-resistance integrated MOSFETs

Application Fields

The LM3351MMX/NOPB can be used in a wide range of applications, from solar PV systems, to battery powered equipment, to high-voltage telecom and industrial applications. They can be used for systems requiring dynamic regulation of the output voltage based on a voltage or current feedback signal. The adjustable output voltage and wide input voltage range make them ideal for applications ranging from ultra-low power battery management to high-current telecom power solutions.

Applications

• Solar PV MPPT and Dynamic Bus Voltage Regulation
• Telecom DC-DC Converters
• Automotive Battery Management
• Low-voltage Supply Regulation
• High Efficiency LED Drivers
• Industrial Battery Management

Working Principle

The LM3351MMX/NOPB uses a pulse width modulation (PWM) control scheme to regulate the output voltage. It operates in average current mode, which allows the device to regulate voltage regardless of the current or power level of the output. The regulator uses an on-chip oscillator to generate a pulse-width modulated signal of adjustable frequency. This signal is sent to the gate of an integrated MOSFET switch, which switches between a high and low state in order to regulate the output voltage.

The output voltage is controlled by an integrated error amplifier, which compares the actual output voltage to a set reference voltage. When the output voltage is too high, the error amplifier will cause the duty cycle of the PWM signal to decrease, which in turn decreases the output voltage. Conversely, when the output voltage is too low, the error amplifier will increase the duty cycle of the PWM signal, which increases the output voltage.

The LM3351MMX/NOPB also includes integrated protection features such as under-voltage protection, over-voltage protection, over-temperature protection, and current limiting. It also has adjustable voltage, current, and frequency settings for optimal operation in the desired application.

Conclusion

The LM3351MMX/NOPB is a versatile DC-DC switching regulator that is designed for maximum power point tracking (MPPT) and other applications requiring dynamic bus voltage conversion. Its wide input voltage range and adjustable output voltage make it suitable for a variety of applications, from low-power battery management to high-current telecom power solutions. The integrated protection features and programmable settings make it a robust and reliable solution for demanding applications.

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