TPS2105MDBVREP

The TPS2105MDBVREP is a primary-side power management integrated circuit (PMIC) that functions as an OR controller, ideal diode and auxiliary power enable. Developed by Texas Instruments, the integrated circuit offers several advantages over discrete solutions, including reduced footprint, easy synchronization and cost savings. As a primary-side regulator, the device allows designers to short-circuit proof power supplies that are powered directly from rectified mains voltage. Its ideal diode circuitry adds a soft-start feature to allow for start-up and hysteresis control of the device.

The TPS2105MDBVREP OR controller works by sensing a voltage drop across two resistors, Rctl and Rfbc. As the current flowing through the rectified mains changes, the ratio of the two resistors will cause the voltage at the sense pin to rise and fall. As this voltage passes a certain threshold, the OR controller will drive the main relay on or off, thereby controlling the output voltage. The auxiliary enable pin, TN—TEN offers a safety feature that prevents the main relay from being activated until it senses the presence of an auxiliary supply voltage at the auxiliary enable pin. This ensures that the controller remains inactive during the initial power up stages, preventing short circuits from occurring.

The TPS2105MDBVREP ideal diodes circuit offers protection against reverse current and prevents the power supply from draining power via the input rectifier when the supply voltage is lower than the expected load voltage. This feature is important for protecting circuits attached to the output of the power supply from reverse currents, as well as ensuring that the power supply does not feed back power into the load during short-term power disruptions.

The device also includes an over-voltage protection (OVP) feature. When the sensed voltage rises above a certain level, the OR controller will turn the main relay off and protect the primary side components from damage. The device also employs an under-voltage protection (UVP) feature, which will turn the control circuit off if the sensed voltage drops too low and reduce the chances of harmonic distortion occurring.

The TPS2105MDBVREP is a versatile primary side PMIC that offers a variety of features in a compact package. As an OR controller, it can detect a signal generated by two resistors and turn the main relay on and off to control the output voltage. Its ideal diode circuitry prevents reverse currents, as well as protecting the power supply from draining power from the load during short-term power disruptions. The device also includes an over-voltage and under-voltage protection that guards against short-circuits or over-voltage conditions. This integration of features makes it an ideal solution for a variety of applications, from LED lighting to telecom power supplies.