REC3-4805SRW/H4/A/SMD

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DC-DC converters provide conversion between different levels of power. They take power from a higher voltage source and convert it into a lower voltage. There are a wide variety of different types of DC-DC converters and one of the more specialized examples is the REC3-4805SRW/H4/A/SMD. This article will provide an overview of the application field and working principle of the REC3-4805SRW/H4/A/SMD.

Application Field of the REC3-4805SRW/H4/A/SMD

The REC3-4805SRW/H4/A/SMD is a 4-stage synchronous buck DC/DC converter, designed for applications requiring a medium power (up to 60 W) and a wide voltage input range (18 to 75 VDC). It has outstanding control features, such as active current sharing between multiple converters, virtual remote sensing for improved dynamic regulation, spread spectrum frequency modulation, adaptive voltage positioning and simple external synchronization.

The converter comes with synchronous rectification to minimize power losses and reduce input current ripple and an internal selective circuit to reduce the impact of the load transient response in poly-phase systems. It also provides soft start capability, a frequency foldback feature, power good and power fail alarm outputs, an OCP/OTP circuit, SSFN option for noise sensitive applications, etc.Its wide input voltage range and extensive control features make it ideal for use in a wide variety of applications, including distributed power systems, communications, industrial robotics, home appliances and consumer electronics.

Working Principle of the REC3-4805SRW/H4/A/SMD

The REC3-4805SRW/H4/A/SMD relies on two synchronous power switches, one master and one slave, and two inductors, as shown in Figure 1. Both power switches operate in a Pulse Width Modulation (PWM) mode to regulate the output voltage.

The master switch is connected to the input voltage, and the slave switch is connected to ground. When the master switch is turned on, the inductors are energized and the input voltage is applied to the output. When the switch is turned off, the inductors discharge into the output and the output voltage remains constant.

The master and slave switches are driven in anti-phase to regulate the output voltage. The frequency and duty cycle of the PWM signal are determined by an internal voltage feedback loop. The voltage feedback loop compares the output voltage to a reference voltage and adjusts the duty cycle of the PWM signal accordingly to ensure a constant output voltage.

The REC3-4805SRW/H4/A/SMD also incorporates a synchronization capability that allows it to be synchronized to an external clock. This is particularly useful in applications requiring multiple converters in a poly-phase system since it allows the converters to operate in phase with each other.

Conclusion

The REC3-4805SRW/H4/A/SMD is a DC/DC 4-stage synchronous buck converter, designed for applications requiring a medium power and a wide voltage input range. It provides outstanding control features and excellent response to transient conditions. It is ideal for distributed power systems, communications, industrial robotics, home appliances and consumer electronics. Its working principle relies on PWM and regulation of the output voltage is done through a voltage feedback loop.

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