LM2678SDX-5.0/NOPB

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The LM2678SDX-5.0/NOPB is a monolithic Integrated Circuit (IC) featuring a synchronous buck converter. It is a feature-packed DC-DC switching regulator that is tailored to meet the requirements of systems incorporating higher input voltage and higher current applications. It is a member of the family of voltage regulators from the Texas Instruments (TI) portfolio. The LM2678SDX-5.0/NOPB is compatible with the high-performance, low-cost, voltage-configurable and highly integrated product family of DC or DC/DC converters and Voltage Regulators.

The LM2678SDX-5.0/NOPB is a monolithic Integrated Circuit (IC) featuring a synchronous buck converter and provides adjustable outputs in the range of 0.5V to 5V (adjustable). It offers one of the highest current rating available in a tiny 8 pin package. The regulator and a Vref resistor form an adjustable voltage divider with an output pin and a ground terminal. This pin is connected to the IC\'s REF input, which allows the user to fine tune the output of the converter for a desired voltage simply by adjusting the value of the resistor.

The LM2678SDX-5.0/NOPB is designed for high power applications and is capable of delivering 3A output current. It also has an adjustable soft-start feature that helps to reduce turn-on and turn-off surges. The soft start helps to prevent the output voltage from rising too quickly when the output load is applied and helps to prevent the output voltage from sinking too far when the output load is removed. It is also able to provide a low noise, low ripple regulator output.

The LM2678SDX-5.0/NOPB is a synchronous buck converter that uses current mode control via a constant frequency (CF) synchronous rectifier driver. It has a typical quiescent current of 5mA and a maximum charging current of 3A. It also features a maximum switching frequency of 500kHz, allowing the regulator to provide up to 500kHz of output noise-free ripple. It also has a very high-efficiency of up to 90% for full load operation.

The LM2678SDX-5.0/NOPB also has a built-in power-on reset circuit which enables the user to initialize the output voltage at the desired value. It also has an on-chip error amplifier and over-temperature protection. The IC also has protection from shorted loads, overvoltage, and overtemperature. It is designed to operate from a 4.75 V to 22 V input supply range and comes in the widely used 8-pin TSSOP package.

Features such as improved EMI performance, high efficiency, robust protection, and excellent noise immunity make the LM2678SDX-5.0/NOPB an ideal choice for applications such as automotive on-board diagnostics, digital power supplies, and industrial control circuits. The device is well suited for both low-cost and high-performance systems.

Application Field

The LM2678SDX-5.0/NOPB is suitable for applications such as automotive on-board diagnostics, digital power supplies, and industrial control circuits, as well as for systems which require high efficiency yet quiet operation. With its high power rating and adjustable output voltage, the LM2678SDX-5.0/NOPB is suitable for a wide range of applications including LED lighting, power amplifiers, IT equipment, and battery charging.

Working Principle

The LM2678SDX-5.0/NOPB is a synchronous buck regulator which uses a constant frequency (CF) synchronous rectifier driver for current mode control. It works on the principle of Linear Regulation. Linear regulation allows the output voltage to be accurately set by adjusting the value of a resistor. The input voltage also needs to be higher than the output voltage for this system to work. The operation of the LM2678SDX-5.0/NOPB is explained in further detail below.

The input voltage is connected to the input of the converter. The power rating of the LM2678SDX-5.0/NOPB is determined by the maximum current and voltage it can handle. After passing through the power stage, the voltage is then regulated by the feedback circuitry which senses the output voltage and compares it with the reference voltage. This information is then used to adjust the power stage to maintain the correct output voltage.

The LM2678SDX-5.0/NOPB circuit uses a Vref resistor to divide the output voltage by two to create a reference voltage for the feedback loop. The Vref resistor can be adjusted to change the output voltage of the regulator. The output of the regulator is also affected by the current-sensing resistors, which is adjustable to set the output current limit. The converter also has a thermal-protection circuit which shuts off the converter in the event of over-temperature conditions.

The LM2678SDX-5.0/NOPB is an efficient and low-cost DC-DC switching regulator ideal for high-current applications. It is designed to deliver high output current with a wide input voltage range and adjustable output voltage. The LM2678SDX-5.0/NOPB also offers excellent EMI and noise immunity, a low quiescent current, and adjustable soft start and over-temperature protection. It is suitable for a wide range of applications and is a reliable choice for system integration.

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