LX1553IM

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LX1553IM is a cost-effective, high-efficiency, synchronous integrated phase-shifted full-bridge DC-DC switching controller with single-chip, low external component count for demanding applications. It is a three-phase reduced system, which provides complete control functions for synchronous rectification and anti-saturation control for high-efficiency single-ended and half-bridge DC-DC converter designs, making DC-DC converter design easier. LX1553IM is part of the PMIC - Voltage Regulators - DC DC Switching Controllers family and is characterized by its high performance, integrated design, and high flexibility.

Application Field of LX1553IM

LX1553IM is ideal for applications where high efficiency is important, such as in automotive, industrial, consumer, and point of load applications. Due to its wide input operating voltage range of 4V-38V, LX1553IM can accommodate a wide range of input sources, including 12V battery, 4V-24V AC/DC wall adapter, or 24V rail. It is able to provide high efficiency over the load range from 0.1A to 10A, and its output voltage can be as low as 0.8V with well-controlled line and load regulation.

Besides, with the internal spread spectrum function, LX1553IM can provide a significant advantage in AM and RF noise reduction. This feature is critical in applications where electro-magnetic compliance is important. Also, the aging, over-temperature and over-voltage protection features ensure the robust system operation and protect the load from the event of output malfunction.

Working Principle of LX1553IM

LX1553IM working principle is based on pulse width modulation (PWM) technique. The PWM modulation is performed by the internal oscillator, which is intrinsically synchronized with the input voltage. In order to switch the power drain, a PWM signal is generated to drive the gate of a power switch. The PWM signal is generated by the on-chip comparator and is compared with the internal reference voltage.

The controller also performs a digital feedback loop, which is based on a time-sharing control circuit in order to achieve the constant output voltage. This internal control loop constantly reads the voltage of the output terminals and calculates the duty cycle of the PWM for the next cycle accordingly. Finally, the on-chip over-temperature and over-voltage protection circuit will shut down the controller when the temperature, voltage, or any other monitored conditions exceed their preset value.

In summary, LX1553IM is a low-cost, highly-efficient, synchronous PWM DC-DC converter controller, designed for a wide range of applications that require high efficiency, high power conversion, and wide input voltage ranges. The integrated design, with internal oscillator and sub-system functions, enables simpler and faster design of DC-DC converters. The anti-saturation control, spread-spectrum modulation, and wide output voltage adjustable range, provide robustness and high efficiency for an entire system.

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