TPS40077PWPR Integrated Circuits (ICs)

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TPS40077PWPR application field and working principle

The TPS40077PWPR is an integrated DC-DC step down converter controller that implements a single stage power conversion topology. It is a cost effective solution that combines the isolated power MOSFETs, gate drivers, frequency and slope control and protection devices of conventional isolated DC-DC solutions in a small size package. The TPS40077PWPR is specifically designed for medium power (15W-35W) point of load (POL) applications.

Application of TPS40077PWPR:

The TPS40077PWPR can be used in various applications such as notebook computers, industrial control systems, telecom/datacom systems, and automotive environments because of its high efficiency, small solution size, high integration level and cost optimization. In addition to these, since the TPS40077PWPR has an operating frequency adjustable from 10kHz to 2MHz, it can be used in applications where high efficiency at low frequency is key. Examples of such applications are automotive systems with multiple POLs.

Working Principle of TPS40077PWPR:

The TPS40077PWPR is an integrated switchmode power converter controller specifically designed for Point-Of-Load (POL) applications. It is designed to switch mode power conversion, where the output voltage is precisely controlled by the ratio of duty cycle to frequency. The TPS40077PWPR has an internal voltage feedback compensation, so it can stay within the required regulation window under all conditions. It consists of an input voltage sense, a voltage reference, an error amplifier, a clock generator and a vertical power MOSFET switch.

The input voltage to the TPS40077 is sensed, and the error amplifier is used to compare it with the internal reference voltage. The error amplifier output is then integrated into a clock generator which produces a sawtooth waveform. The sawtooth waveform is used to control the on/off time of the vertical power MOSFET. This results in a constant duty cycle PWM signal that is proportional to the input voltage. As the load and input conditions change, the duty cycle changes automatically to keep the output voltage regulated.

The TPS40077PWPR also has integrated protection features such as over-voltage protection, over-current protection, under-voltage lockout and over-temperature protection. The protection features are triggered by the internal protection circuitry and are designed to protect the device from external fault conditions.

Conclusion:

The TPS40077PWPR is an integrated switchmode power converter controller that provides a cost effective solution for medium power Point-Of-Load applications. It is designed to switch mode power conversion and implements a single stage power conversion topology. The TPS40077PWPR has an adjustable operating frequency from 10kHz to 2MHz, which enables it to be used in applications requiring high efficiency at low frequencies. It has integrated protection features and a compact package size, making it a competitive solution for medium power conversions.

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