TPS51117RGYT

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TPS51117RGYT Application Field and Working Principle

The Texas Instruments TPS51117RGYT is a DC-DC switching controller designed for mobile devices and other portable electronics. It can convert a wide range of input voltage sources into a regulated output voltage. The integrated hot-swap functionality and advanced current limiter feature makes the TPS51117RGYT an ideal solution for portable applications.

Features

• Input Voltage Range: 3.3V – 20V
• Programmable Output Voltage: 0.9V – 20V
• Integrated Hot-Swap™functionality
• Advanced current limiter feature
• Integrated startup circuit
• 380kHz fixed-frequency switching
• Adjustable Soft-Start
• Current feed-forward
• Load disconnect and load reconnect
• Prebias startup and undervoltage lockout (UVLO)

Applications

• Mobile and Portable devices
• Portable Electronics
• Battery-operated devices
• Data Storage Equipment
• Wireless and Wired Communication Equipment
• Hard Disk Drives
• PCMCIA applications

Working Principle

The TPS51117RGYT is a single-phase, pulse width modulation (PWM) controller for DC-DC switch mode power converters. It is designed to regulate a wide range of output voltages from 0.9V to 20V from inputs from 3.3V to 20V. The operating frequency can be programmed up to 380kHz. The TPS51117RGYT is suitable for a variety of switching power supplies, such as isolated and non-isolated flyback, SEPIC and basic step-down converters.

The controller uses a fixed switching frequency of 380 kHz and drives an external power MOSFET. The TPS51117RGYT has an internal current-sense amplifier and digital signal processing (DSP) logic built into the proprietary architecture. It has the ability to compensate the current output and adapt it to the input voltage level. The current mode architecture is composed of two feedback loops: a voltage loop and a current loop.

The feedback loop of the voltage loop operates in an inner PI controller and an outer P-type control loop. This control loop can be used for voltage control of the output. The output voltage of the voltage loop is sent to the current loop. The current loop operates in a PWM control system and feeds the output current to the power MOSFET and ensures the output current regulation.

The controller also has a current limiter feature, which limits the output current to the programmed current limit. The current limiter feature is used to protect the power supply under short-circuit conditions. In addition, the controller also has a loop disable feature, a soft-start mode, and an external voltage synchronized signal.

Conclusion

The TPS51117RGYT is a versatile DC-DC switching controller designed for mobile and other portable electronics. It has a wide input voltage range and can produce a regulated output voltage in the range of 0.9V to 20V. It has a variety of features, including Hot-Swap™ functionality, advanced current limiter, startup circuit and various control signaling options. The unique current-sense amplifier and DSP logic incorporated in the controller ensures predictability and accuracy of output voltage and current, thus making it an ideal solution for highly efficient power supplies for mobile and portable electronics.

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