LM3478QMMX/NOPB

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LM3478QMMX/NOPB is an advanced, monolithic generator of simple, off-line, and isolated DC-DC pulse-width modulated (PWM) switching controllers for a wide variety of control and power applications. It combines CMOS control circuitry, a multiplier, four outputs, and other features to provide a regulation-free, isolated, unipolar PWM switching controller with several user selectable parameters.

The LM3478QMMX/NOPB is an ideal choice for applications such as DC-DC converters, SMPS drivers, motor control, and secondary side power management. It is also suitable for powering loads with current demands that are higher than those supplied by most standard voltage regulators.

Application Field

The LM3478QMMX/NOPB controllers are designed to operate within an 8-bit microcontroller as a light or medium-load power conversion and voltage regulation controller. The LM3478QMMX/NOPB controllers can also be used to provide simplified solutions for many of the commonly required low-power, off-line and isolated applications.

It can be used for computer peripherals, AC/DC converters, laptop chargers, and other DC-to-DC boost converters. It can also be used for digital systems that require a simple, efficient and economical power management system. The LM3478QMMX/NOPB controllers are well suited for a broad range of digital and analog applications requiring controlled output voltages within a wide range of input voltages.

Working Principle

The LM3478QMMX/NOPB operates according to a pulse-width modulated switching control algorithm. The device pulses the power switch\'s input voltage conduction in a duty cycle that is proportional to the output voltage set point. Generally, during each switching cycle, the voltage loop will monitor the output voltage and compare it to the set point. A corresponding duty cycle is determined from the comparison and then applied to the power switch. In this duty cycle, the power switch is activated for a proportion of the cycle, resulting in a duty cycle modulation of the output. This duty cycle control algorithm ensures that the output voltage is proportionally controlled relative to the set point.

The LM3478QMMX/NOPB controllers provide several user selectable parameters such as switching frequency, current limiting, and soft-start. The switching frequency is adjustable over a range of 10kHz to 150kHz to provide maximum flexibility. The output voltage is accurately regulated, regardless of the line or load variations. The LM3478QMMX/NOPB controllers also provide additional fixed frequency operation, which eliminates the need for external components. The current limit can be programmed for both continuous and inrush-limited operation. The soft-start feature ensures smooth startup, eliminating output voltage overshoot. All these features make the LM3478QMMX/NOPB controller a complete and efficient off-line control solution.

In conclusion, the LM3478QMMX/NOPB controllers are an ideal choice for a wide range of off-line and isolated control and power applications. This controller provides multiple user-programmable parameters for optimizing power conversion efficiency and operation. Its features make it a reliable, efficient, and cost-effective solution for applications such as DC-DC converters, SMPS drivers, motor control, and secondary side power management.

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