TPS51125ARGER Integrated Circuits (ICs)

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TPS51125ARGER Application Field and Working Principle:

The TPS51125ARGER is a DC/DC switching controller from Texas Instruments (TI) for use in multiple power-supply systems. It is primarily used for voltage regulation, battery charging, load balancing, and load switch control. The device comes in two varieties: the TPS51125ARGER-Q1 and the TPS51125ARGER-TQ1. Both are designed to drive N-channel MOSFETs in order to switch between two power sources. The device is well-suited for automotive and industrial systems, high-power applications, and high temperature environments.

The TPS51125ARGER consists of an integrated driver that can deliver up to 2A and an external ideal diode. The features of the driver, and the external ideal diode, allow the device to drive two power switches of up to 1A each, with a total output power of up to 9W.The device has a wide input voltage range from 6V to 40V, and a wide output voltage range from 0.8V to 38V. The device also has an adjustable current limit, as well as an adjustable switching frequency from 100KHz to 400KHz. Furthermore, the device has a low-power-consumption sleep mode, as well as an overvoltage protection function.

Working Principle:

The TPS51125ARGER is a single-channel MOSFET driver that is designed to deliver regulated output voltage, regardless of the input voltage. The internal driver is capable of delivering up to 2A of output current to the external MOSFETs. Internally, the internal driver circuit consists of two complementary push-pull outputs, a fault protection comparator, and an oscillator for setting the switching frequency. To achieve voltage regulation, the device uses a PWM control scheme and an internal error amplifier to compare the output voltage against a reference voltage, and adjusts the switching duty cycle accordingly.

Internally, the TPS51125ARGER has two power switches, one connected to the power input and the other connected to the power output. When the oscillator starts to count, the power switch connected to the power input is turned on and the power switch connected to the power output is turned off. This allows charging of the output capacitor until it reaches the switching threshold of the internal comparator. When the output exceeds the threshold, the power switch connected to the power output is turned on and the power switch connected to the power input is turned off. This connects the output capacitor to the load and the output voltage is regulated to the desired value.

The TPS51125ARGER also includes an external ideal diode that is used to provide additional current when the output voltage is too low. The external ideal diode is made up of two MOSFETs with their gates connected together, and their sources connected to the output. This allows the device to draw current from the power input regardless of whether the internal power switch is on or off. This can be useful in applications where the output voltage needs to remain stable despite changes in the input voltage.

Conclusion:

The TPS51125ARGER is a well-suited device for voltage regulation, battery charging, load balancing, and load switch control in automotive and industrial applications. It is designed to drive two power switches of up to 1A each, with a wide input voltage range and wide output voltage range. It has internal driver circuitry that can deliver up to 2A and an external ideal diode to provide additional current when the output voltage is too low. With its overvoltage protection, adjustable current limit, and adjustable switching frequency, the TPS51125ARGER is a versatile and reliable solution for DC/DC switching control in a variety of applications.

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