L4962E/A

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The L4962E/A is a high performance controller for high efficiency and low standby consumption in synchronous step-down applications. This application note will explain the applications and working principles of L4962E/A.

Applications of L4962E/A

The L4962E/A is a highly integrated controller specifically designed for powering small, low voltage systems in industrial, communications and consumer applications. Typically the L4962E/A can be used in DC-DC switching regulators or battery chargers, such as 12V industrial applications, set-top boxes, modems, routers and base stations, automotive electronics, portable computing devices, and telecom power systems.

The L4962E/A features efficient power saving design, which provides a low quiescent current operation with low-profile components. The L4962E/A also features both current mode and voltage mode control to reliably assure fast loop compensation, overcurrent protection and soft start.

Thanks to its high voltage rating (up to 70V), high output current accuracy (maximum 6A) and its low start-up current (less than 10mA), the L4962E/A can satisfy a variety of needs. The L4962E/A itself comes in the HSOP-24 package, and can easily be mounted on a standard PCB. The small size of the package is also advantageous, as it allows for the greater design flexibility to incorporate the L4962E/A into space-constrained applications.

Working Principle of L4962E/A

The L4962E/A uses synchronous buck PWM (pulse width modulation) converter circuits to save energy. When power is supplied to the L4962E/A, the inductor is charged until it exceeds the regulator\'s current limit. When the limit is reached, the power transistor turns off and the diode switches from conduction to cut-off. At this point, the voltage across the inductor begins to reduce. When the power transistor turns on again, the diode switches from cut-off to conduction, and the energy stored in the inductor is discharged into a load.

As the inductor is charged and discharged, the regulator adjusts its duty cycle according to the applied input voltage and the voltage across the output capacitor, thus regulating the output voltage. When the duty cycle is decreased, the current through the inductor decreases, as does the current in the power transistor, resulting in a lower power dissipation. This makes the L4962E/A highly efficient and allows it to be very small in size, which in turn increases the power efficiency of the whole system.

In addition to the efficient power saving design, the L4962E/A also features both current mode and voltage mode control to reliably assure fast loop compensation, overcurrent protection and soft start. The current mode operates on a constant current limitation principle, which monitors the load current and prevents it from exceeding a certain preset level by controlling the driven power transistor. The voltage mode uses a pulse width modulation signal to adjust the output voltage according to the applied input voltage.

The L4962E/A also includes a series of regulators, protections and auxiliary control functions such as over temperature protection, current limitation, voltage positioning, remote shutdown and over current protection. The integrated circuits and the corresponding discrete external components together work to ensure reliable protection and accurate regulation.

Conclusion

The L4962E/A is an efficient and versatile controller specifically designed for powering small, low voltage systems in industrial, communications and consumer applications. It features efficient power saving design, high voltage rating, high output current accuracy and low start-up current which makes it suitable for a wide variety of applications. In addition, it also includes a variety of integrated regulators, protections and auxiliary control functions which makes it reliable and safe. The L4962E/A may be the ideal choice for power designers seeking an integrated and good cost-performance solution.

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