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PMIC - Gate Drivers

The TPS2811QPWRQ1 is a regulator controller integrated circuit (IC) designed for use in switched mode power supply (SMPS) circuits for a variety of industrial, consumer, computing and communications applications. By integrating the functions of a primary-side controller IC and a secondary-side power switch IC, the TPS2811QPWRQ1 reduces component count and total design time in addition to being capable of robust, reliable performance in both continuous conduction mode (CCM) and discontinuous conduction mode (DCM) operation.

Application field

The TPS2811QPWRQ1 is ideal for industrial, consumer, computing and communications applications including isolated flyback converters, high power adapter, LLC resonant converters, ACM PFCs, Class D amplifiers and other power switching applications.

Working Principle

The TPS2811QPWRQ1 is primarily a controller IC that contains a primary control loop comprised of a voltage regulator, oscillator and a current sensing control (CSC) circuit. When in CCM operation, the controller is designed to maintain the current at its peak value, while in DCM operation, the controller is designed to maintain the voltage at its peak value. When in both CCM and DCM operation, the CSC circuitry is used to limit the maximum gate drive voltage and current to ensure the gate FET is not overstressed.

The TPS2811QPWRQ1 also includes a low side gate driver circuit. The low side gate driver circuit is used for controlling the secondary side switch FET, providing protection for the power FET if the voltage or current limit is exceeded. The output (Gate Drive) voltage of the TPS2811QPWRQ1 is adjustable from 8V to 20V, allowing for the selection of proper FET gate resistor, drive voltage and frequency. In order to achieve optimal system performance, the output drive voltage can be trimmed using external resistors to guarantee the initiation of CCM and DCM operation.

In addition, the TPS2811QPWRQ1 provides protection against overvoltage and loss of synchronization. The voltage sense circuit monitors the output voltage of the primary side, allowing the on-chip OVP trip point to be adjustable by connecting an external resistor. The synchronization circuit detects and corrects cycle by cycle variations in the switching period, ensuring that the power MOSFET switch is not damaged.

Overall, the features and functions of the TPS2811QPWRQ1 make it an ideal choice for a variety of industrial, consumer, computing and communications applications for converting DC or AC energy to higher output voltages or currents, as well as providing protection for the power MOSFET switch during CCM or DCM operation.

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