LT3471EDD#TRPBF

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LT3471EDD#TRPBF Application Field and Working Principle

LT3471EDD#TRPBF is a voltage regulator integrated circuit (IC) belonging to the family of DC-DC switching voltage regulators. This device is powered directly by the input voltage and offers an adjustable output voltage. It includes a ground reference for the output voltage and an onboard switching power management controller for the regulating functions. This switching controller has the ability to monitor and sense the output current and adjust the output voltage accordingly. As a result, it automatically adjusts the operating frequency of the switching pulse width modulation (PWM) circuitry to maintain a constant output voltage.

The LT3471EDD#TRPBF is designed to provide three functions: voltage regulation, pulse-width modulation (PWM) regulation, and over voltage protection. Its voltage regulation is done by monitoring the output voltage and adjusting the duty cycle of the switching signal accordingly. Its PWM regulation ensures a smooth voltage transition with minimal power stresses. Finally, the over voltage protection protects the downstream components by clamping the output voltage if the driven load is too large.

The LT3471EDD#TRPBF is typically used in industrial, telecom and computer applications. It has been designed for systems where high efficiency and accurate output voltage regulation is required. In some systems, it can replace more than one DC/DC regulator, thereby reducing board complexity and cost. Moreover, as the output voltage can be adjusted using an external voltage reference, the load transient response of the system is improved.

The LT3471EDD#TRPBF has an input voltage range of 4.5V to 40V and can support an output voltage range of 0.8V to 38V. This IC is capable of controlling an output current up to 2A with a loop bandwidth of 20kHz. The switching frequency can be adjusted between 200kHz to 2MHz in order to achieve a better dynamic response and optimized efficiency.

The LT3471EDD#TRPBF uses pulse width modulation (PWM) control with a switchable current mode control architecture to ensure accurate and precise output voltage control. It features an external voltage reference circuit, an integrated 5µA current source, a dual voltage comparator, an oscillator and a PWM comparator. The voltage reference circuit can be used to adjust the output voltage and the integrated current source helps in setting up the switchable current limit.

The dual voltage comparators are used to compare the voltage feedback signal to a voltage reference and to detect over voltage conditions. The integrated oscillator generates a constant frequency clock signal which is used by the PWM comparator to generate the PWM switching signal. The switching signal is then fed to the switch current driver which generates the actual current to switch the power MOSFET.

In summary, the LT3471EDD#TRPBF is a DC-DC regulator IC designed to provide accurate voltage regulation, smooth voltage transition, and over voltage protection. It is well suited for telecom, computer, and industrial applications where high efficiency and precise output voltage regulation are important.

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