LM5121MH/NOPB

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Applications for the LM5121MH/NOPB DC/DC working controller are wide-reaching and provide solutions to a variety of projects. This device is a powerful, low-cost, high-performance current mode, step-down DC/DC controller from the Texas Instruments Wide Input Voltage Range. It is essential for regulating output voltages from an input supplies that are either battery or active DC sources. It is versatile and easy to use, offering the benefits of an adjustable switching frequency up to 1 MHz and a programmable soft start up feature. This is an ideal device for projects such as compact, portable (digital) systems, LED lighting, audio amplifiers, industrial control, motor control and automotive conversion systems.

The LM5121MH/NOPB is comprised of a controller and its own power supply, typically 12V-24V. It is configured to switch its output voltage according to the voltage set at its output; a user must set either a minimum or maximum output voltage. This voltage adjustment can be done digitally, through its on-chip memory cells, or with the use of external resistors, such as the LM36261. The controller offers both single and dual output versions and is able to support high power output.

The working principle behind this controller is based on a powerful switching strategy that utilizes two phases for fast transient response and excellent voltage regulation. By employing an active regulation mode, it is able to regulate the output voltage over a broad range of load conditions and input voltages. Its topology also consists of two low-side power MOSFETs placed in a bridge configuration, so that when the first MOSFET is enabled, the second is disabled, keeping the input and output voltages separated. The controller can be configured to enhance efficiency by utilizing pulse-width-modulation (PWM) and/or pulse-frequency-modulation (PFM) to regulate the output voltage.

The LM5121MH/NOPB takes advantage of a fast-transition and low EMI frequency of operation to maintain stability across its entire dynamic input/output operation range and output load changes. It uses a current(peak)-mode control and adaptive-on-time control with an adjustable off-time, allowing it to achieve a high efficiency over a wide range of input/output conditions. The controller uses a multiphase-burst mode to reduce output ripple to a minimum. It also supports a hysteretic-mode circuit-protection scheme that operates with a built-in voltage or current limit threshold that protects the device from overpower conditions.

The controller has protection against under/over-voltage faults, shorted-load faults, over-temperature protection, as well as selectable over-current protection. It is able to provide an adjustable current-limit threshold which can be set higher, to reduce MOSFET power dissipation associated with current-limit protection. The device also features protection features against accuracy errors, resulting in reliable, cost-effective design and improved performance over traditional control methods.

The LM5121MH/NOPB application field and working principle make it a powerful, low-cost, high-performance solution for regulating output voltages from an input supplies that are either battery or active DC sources. It is versatile and easy to use, offering the benefits of an adjustable switching frequency up to 1 MHz and a programmable soft start up feature. The fast-transition and low EMI frequency of operation help keep the device stable across its entire dynamic input/output operation range and output load changes, resulting in reliable, cost-effective design and improved performance over traditional control methods.

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