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PMIC - Voltage Regulators - DC DC Switching Regulators

The purpose of DC-DC switching regulators is to convert an input DC Voltage to any required output voltage. DC-DC switching regulators are efficient as they can produce an output voltage that is much higher or lower than the supplied input voltage using smaller devices. Typically, a DC-DC switching regulator is designed to provide a regulated output voltage over a wide range of input voltages.

RAA230153GSB#HA0 is a synchronous buck regulator, which is a type of DC-DC switching regulator. The RAA230153GSB#HA0 has a wide input voltage range, up to 32V and can output up to 10A. It has both internal and external soft-start capability as well as configurable current-limit protection.

RAA230153GSB#HA0 is suitable for a variety of applications such as Point-of-Load (POL), Intermediate Bus Converters (IBC), and offline fixed/adjustable output converters. It is designed specifically for high-efficiency, low-noise, and low-EMI applications, making it ideal for automotive, industrial, and audio applications.

Working Principle of RAA230153GSB#HA0

The RAA230153GSB#HA0 operates by using two power MOSFETs in a completely synchronous buck converter configuration. The circuit’s principle of operation is based on the concept of a charge pump, where two power switches alternately charge and discharge two storage capacitors through a common inductor. Control of the output voltage is accomplished by adjusting the duty cycle of the power switches and the resulting current flow through the inductor.

The circuit relies on both primary side (non-isolated) and secondary side (isolated) control. On the primary side, a feedback loop drives an LM5041 controller that sets the output voltage by adjusting the duty cycle based on an external potentiometer. On the secondary side, an optocoupler allows the feedback voltage from the delivery end of the circuit to be read, allowing more precise control of the output voltage and excellent regulation performance.

Conclusion

The RAA230153GSB#HA0 is designed as a low-noise, low-profile switching regulator that is capable of providing high efficiency and excellent power supply performance. It exhibits very low output noise and is suitable for automotive, industrial, and audio applications. Its wide input voltage range and configurable current-limit protection make it suitable for a variety of applications. Additionally, the combination of primary and secondary side control provides reliable regulation of the output voltage.

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