LM2586T-5.0/NOPB

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LM2586T-5.0/NOPB application field and working principle

LM2586T-5.0/NOPB is a DC/DC switching regulator, designed for adjustable and fixed voltage applications. It is consisted of an internal 5A pulse width modulator (PWM) controller and an avalanche-rated logic-level power MOSFET. The PWM controller uses peak current-mode control architecture which offers a fast transient response and eases the compensation requirements.

The LM2586T-5.0/NOPB provides an excellent line and load regulation over specified input and output voltage range. It includes a built-in current-mode feedback circuit, soft-start/hiccup short-circuit protection, over-temperature protection, an input-undervoltage lock-out, output disconnect feature and a pin-strap voltage selection configuration.

The LM2586T-5.0/NOPB operates from 4.5V to 40V input voltage ranges and provide an adjustable output voltage from 1.25V to 37V. It can deliver up to 5A continuous output current and is capable of a peak output current of up to 7.5A for a short duration. The efficiencies of up to 95% allow the regulator to handle high ambient temperatures without the need for any additional heatsinking or cooling system.

Working principle

The LM2586T-5.0/NOPB operates on current mode control principle. In simple terms, this circuit consists of a power MOSFET switch and a pulse-width modulator (PWM) control circuit. The PWM controller senses the instantaneous current and supplies a short pulse to turn on the switch every time the current reaches the peak of its waveform. When the switch is off, the output voltage begins to decay and when the current falls below the set threshold value, the controller senses it and switches the switch back on to reset the voltage.

The LM2586T-5.0/NOPB provides an excellent line and load regulation. The duty cycle of the pulses is varied according to the difference between the input voltage and output voltage. This ensures that the output voltage remains relatively constant, regardless of the load variations. The pulse input also ensures that the power MOSFET does not get excessively hot and, therefore, does not require a heatsink for proper operation.

The LM2586T-5.0/NOPB also offers excellent thermal performance, enabling it to deliver up to 5A of current while keeping the junction temperatures below the specified limit. The efficiency of the device is also very good, allowing it to perform up to 95% of peak efficiency.

Applications

The LM2586T-5.0/NOPB is an ideal choice for applications requiring an adjustable or fixed output voltage up to 37V. Examples include battery-powered and mains-powered consumer electronics, toys, refrigerators, air conditioners, etc. The device is also suitable for car and industrial applications, such as uninterruptible power supplies, adjustable motor drives and powered tools. The device offers excellent transient response, allowing the user to optimize the output voltage for each usage scenario.

The LM2586T-5.0/NOPB is also very suitable for applications requiring high efficiency, since it can deliver up to 95% of peak efficiency. Due to its excellent thermal performance, the device does not require a heatsink, thus making it an ideal solution for portable electronics applications.

Overall, the LM2586T-5.0/NOPB is an excellent choice for adjustable and fixed voltage applications, as it offers excellent line and load regulation, low output ripple, fast transient response and high efficiency.

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