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LTC3730CG#TRPBF Application Field and Working Principle

The LTC3730CG#TRPBF is a high-voltage synchronous buck converter switching regulator integrated circuit (IC) from Linear Techonology, with wide ranging inputs and a highly flexible array of configurable features. It is part of the family of specialized modules classified as PMIC - Voltage Regulators - Special Purpose.

This IC can accept input voltages of up to 40V, making it suitable for a wide range of applications. It is especially useful in applications where the input power source is variable, such as those involving renewable energy sources, and offers high-efficiency operation up to 95%. It is also useful for portable systems, as it allows for a single power supply design, eliminating the need for dedicated input and output power stages.

Features

• Supports a wide input voltage range of 4.5V to 40V.
• Wide output voltage range of 0.665V to 37V with ±2% accuracy.
• Wide operating current range of 10mA to 3A.
• Synchronous operation with N-channel MOSFETs for higher efficiency.
• Current-mode control for fast transient responses.
• Integrated soft-start and over-current protection.
• Integrated under-voltage lockouts.
• UVLO, max-duty-cycle, over-temperature and over-voltage protection.

Working Principle

The LTC3730CG#TRPBF is a synchronous buck converter, so it works by switching its power stage on and off at a frequency determined by a feedback signal. The signal is generated by an external resistor divider connecting the output voltage to an internal voltage reference. As the output voltage rises, the voltage reference signal increases and initiates an increase in the frequency of the converter’s switching signal, thus regulating the output voltage.

The LTC3730CG#TRPBF operates in current-mode control, with a frequency and phase-shift modulation control loop that helps ensure fast current loop response times. The IC also features synchronous rectification and is configured for operation in either continuous or discontinuous conduction mode.

In continuous conduction mode (CCM), the switching frequency is fixed and the duty cycle is proportional to the difference between the input and output voltages. In discontinuous conduction mode (DCM), the switching frequency is proportional to the input-output voltage difference, while the duty cycle is held constant. This helps to reduce power dissipation in light load conditions when the IC is operating near its minimum duty cycle.

Applications

The LTC3730CG#TRPBF is an ideal IC for a wide range of high-voltage, high-efficiency applications. It is suited to renewable energy systems, such as solar and wind energy, where the input voltage can vary over a wide range, and for portable systems where the high efficiency reduces the heat dissipation and increases the component lifetime. It is also suitable for bi-directional DC/DC converters, allowing seamless switching between buck and boost operation.

Other applications include active clamped converters and multi-output power supplies, such as those found in wireless base stations, automotive and industrial modules and applications involving a wide range of output voltages.

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