TPS54625PWP

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Texas Instruments’ TPS54625PWP offers an integrated step-down DC/DC converter that helps low-power applications for the industrial, automotive, and consumer markets. This buck regulator is recognized for its excellent performance, size, and flexibility. It also provides robust protection against thermal overload, under voltage lockout (UVLO), output disconnect, inrush current limiting (ICL), and over current protection (OCP).

The TPS54625PWP includes a controller, power FETs, and both input and output caps. It provides an input range of 4.5 - 28 V and an output range of 0.6 - 20 V. There are two timing pins (T1 and T2) which can be used to control the output voltage ramp on each cycle. It also features adjustable soft-start and adjustable maximum output current (up to 15 A). The controller uses patented adaptive style control to offer higher efficiency, lower output noise, and reduced EMI.

The TPS54625PWP is an ideal product for industrial and automotive applications, especially when the transition from the core supply to the point of load requires low-voltage, high-current power. It can be used for LED lighting, motor control, and communication baseband, as well as many other portable applications. It has very low noise, better performance and protection, making it the ideal choice for low-power solution needs.

Working Principle

The TPS54625PWP works on a switching controller-based design. It features two control pins to adjust the output voltage ramp and over current setting. The core of the TPS54625PWP is composed of a synchronous buck converter and a comparator for over current protection.

When the input voltage of the TPS54625PWP is higher than the output voltage, the MOSFETs in the synchronous buck converter are enabled. During this state, the inductor current increases steadily at the falling slope of the input voltage waveform. The current flow from the input to the output accumulates in the output capacitor, and the output voltage rises accordingly.

When the TPS54625PWP senses the output voltage is higher than the requested voltage, the synchronous buck converter turns off the MOSFETs, and the indicator current also shifts to the opposite direction toward ground. Eventually, the output voltage is forced to drop.

The TPS54625PWP can efficiently adjust its internal parameters, such as the protection thresholds and ramp rate, through two external pins (T1 and T2). This device utilizes its integrated power FETs and µController Unit (MCU) to provide over current protection and thermal shutdown.

In the output power stage, the TPS54625PWP integrates a maximum output current setting and a dynamic OVP feature. The maximum output current can be set from 0.5 A to 15 A using two external resistors. The dynamic over voltage protection protects the system from higher-than-expected output voltage levels and allows the system to continue operating during light load conditions.

It is also important to note that the controller optimizes its performance in the step-down regulation mode without overshoot or ringing. The controller also sends out warning messages and shuts down the device when the conditions exceed its safe working limits.

In summary, TPS54625PWP is a step-down DC/DC converter with excellent efficiency, size, and flexibility suitable for low power applications in the industrial, automotive and consumer markets. Its low noise, robust protection, and adjustable output current are the perfect choice for achieving a reliable and power-efficient low-power solution.

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