L5956PDTR

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As a part of the Power Management Integrated Circuits (PMIC) from STMicroelectronics, the L5956PDTR is a Voltage Regulator particularly intended for Special Purpose thanks to its wide array of features and capabilities. Many applications benefit from its capabilities, such as LED backlighting, line-powered battery chargers, mobile phone and USB-powered applications.

This device integrates several features. First, this voltage regulator integrates an omni-directional protection. This ensures voltage protection in either direction and delivers protective control when the power dissipation is exceeded. Second, this regulator has a soft start feature which eases the start-up at power-up. This can be adjusted per application needs, allowing the user to select load regulation parameters. Third, the L5956PDTR has an Automatic Terminal-awareness (AT) feature which provides an independent power distribution and control through the use of just a few pins. Finally, the device offers very fast response time of 1µs and can accept a power-up delay of up to 300s, allowing the choice of the most suitable voltages for the application.

The L5956PDTR works as a flyback circuit in quasi-resonant mode, which results in more efficiency over both the light and full range of output load conditions. Its working principle consists of storing energy in a diode-inductor combination, and then the stored energy is transferred to the load from the output capacitor. This scheme requires less output capacitors to achieve the same output wattage of a continuous mode power supply. The voltage regulator also performs current-mode control, which provides tight load regulation, fast transient response, and improved line regulation. The control technique in use allows the current to flow in small portions per cycle, resulting in less switching losses.

In sum, these features make the L5956PDTR an ideal voltage regulator for special purpose applications. Special care must be taken when selecting the output capacitor and choosing the right features to match the application needs.

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