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Introduction

The LFC789D25CD is a linear regulator controller manufactured by Lite-On. As a member of the PMIC - Voltage Regulators - Linear Regulator Controllers family, it is designed to provide an adjustable output voltage from 2.5V to 25V. This specially crafted controller is able to operate at switching speed of up to 1.5MHz, and its accuracy is within 1%.

Application Fields

The LFC789D25CD operator is suitable for DC/DC converters and step-down, step-up or inverting (buck, boost, buck-boost) applications, from 2.5V to 25V, with switching frequencies of up to 1.5MHz.

More specifically, the product series is ideal for computer monitor power supplies, AC/DC adapters and portable devices that require accurate low voltage regulation.

Working Principle

The LFC789D25CD is an integrated circuit that uses voltage regulator technology. It works by converting a DC voltage from unregulated to stabilized voltage which can be applied correctly to a specific device.

The controller uses the principle of pulse width modulation (PWM) to generate voltage conversion. This is done by means of two comparators: one measures the output voltage while the other senses 14-bit digital signals to set the output voltage.

The controller takes a fixed voltage supply at its input and applies it to a transistor switch. The transistor opens and closes on very short cycles, allowing the internal power switch to be turned on and off rapidly.

When the switch is on, a current continuously flows through the transistor and powers the output circuit. When the switch is off, the current flow is interrupted, effectively preventing any current from flowing through the transistor.

Conclusion

The LFC789D25CD is a versatile controller that is suitable for a variety of applications. With its easy-to-use input terminal, adjustable output voltage and switching speed of up to 1.5MHz, the controller is ideal for DC/DC converters and step-down, step-up or inverting (buck, boost, buck-boost) applications, from 2.5V to 25V.

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