SI9122ADLP-T1-E3

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SI9122ADLP-T1-E3 Application Field and Working Principle

The SI9122ADLP-T1-E3 is a high-efficiency integrated DC/DC switching converter controller designed for use in power supply systems such as TV sets, DVD players and mobile phones. It has an integrated high efficiency step-down controller and an adjustable power supply of up to 5.5V. The device is designed with a low voltage operation, low high-side Qswitch, fast transient response and over-temperature protection.

Features

• Integrated high efficiency step-down controller
• Adjustable power supply of up to 5.5V
• Low voltage operation
• Low high-side Qswitch
• Fast transient response
• Over-temperature protection

Applications

• Power supply systems for TV sets
• DVD players
• Mobile phones

Working Principle

The SI9122ADLP-T1-E3 is based on the non-isolated Buck topology, and works as a DC/DC switching convertercontroller. The main difference between this device and other Buck controllers is that it is able to automatically adjust the output voltage range depending on the input voltage, enabling efficient operation over a wide range of input voltages. This feature is enabled by the multi-level control loop, which works as follows:

• The voltage feedback loop first sets the output voltage of the device by comparing the reference voltage with that of the output voltage.
• The current limit circuit then sets the peak and valley currents of the device.
• Finally, the Linear Regulator sets the quiescent current to regulate the output voltage of the device.

The operation of the device is based on two basic modes: the linear operation mode, and the switching topology mode. The linear operation mode is used when the input voltage is less than the output voltage, in order to efficiently supply the load. The switching topology mode is used when the input voltage is higher than the output voltage, in order to minimize power loss. The device supports both continuous and discontinuous conduction modes.

Conclusion

The SI9122ADLP-T1-E3 is a high-efficiency integrated DC/DC switching converter controller designed for use in power supply systems such as TV sets, DVD players and mobile phones. It has an integrated high efficiency step-down controller and an adjustable power supply of up to 5.5V. The device is designed with a low voltage operation, low high-side Qswitch, fast transient response and over-temperature protection. The device works on the basis of two basic modes: the linear operation mode, and the switching topology mode.

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