LM20146MH/NOPB

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The LM20146MH/NOPB is an integrated, medium-voltage, synchronous step-down switching regulator, ideal for a wide range of general purpose and industrial applications. Featuring on-board MOSFET technology and a 4.5V to 50V operating range, the LM20146MH/NOPB offers efficient, current-mode control, adjustable operating frequency, and excellent line and load regulation. With its power density, low noise and low quiescent current levels, the device is an ideal solution for space-constrained applications.

The LM20146MH/NOPB can be used in several applications and systems, such as local supply for logic and processor circuits, dedicated power architectures for industrial and automotive equipment, portable and battery-operated systems, and various regulated power solutions. It offers the versatility of low EMI noise-reducing spread-spectrum mode, cycle-by-cycle current limit, adjustable switching frequency, and programmable soft-start for improved circuit reliability.

The LM20146MH/NOPB uses a MOSFET control scheme, which provides a fast and efficient current-mode operation, while delivering a low output voltage ripple. The switching frequency and the current limit of the device can be adjusted via a single external resistor. This allows the design to be optimized for the power sections, size, and efficiency.

The working principle of the LM20146MH/NOPB is fairly simple. It contains an oscillator, comparing circuit, error amplifier, and current-control circuitry. The oscillator provides a switching frequency, usually in the range of 250 kHz to 500 kHz. The comparing circuit compares two signals, the internal reference and an external ramp/triangular signal (from a bootstrap capacitor). This comparison results in a constant frequency operation, with the output voltage being regulated by the error amplifier.

The current-control circuitry uses a fast-acting comparator and two sense amplifiers to limit the output current. This ensures good current limit accuracy, even with duty-cycles as low as 10%. The current limit value can be adjusted using an external resistor. The combined effect of the fast-acting current-limiting circuit and the adjustable current-limiting function makes the device ideal for providing power to loads requiring over-current protection.

The LM20146MH/NOPB also includes a programmable soft-start feature, which can be set via an external capacitor. The soft-start time can be programmed and is adjustable from 1ms to 8ms. The device also includes an enable pin and phase-shifted clock. This feature allows the LM20146MH/NOPB to be used in both synchronous and asynchronous applications.

The LM20146MH/NOPB is an advanced integrated switch-mode power supply, designed to offer high efficiency and low power consumption. It offers excellent line and load regulation, adjustable switching frequency, adjustable current limit, and programmable soft-start for improved reliability. With its low noise and small size, the device is suitable for space-constrained applications.

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