VRAH-01CX500

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Introduction

DC–DC converters are electronic devices used for converting a source of direct current (DC) from one voltage level to another. It is a type of power converter which is used to convert a constant (DC) input voltage to some changing (AC) output voltage, or to convert some varying (AC) input voltage to some other fixed (DC) output voltage. There are four commonly-used topologies of DC – DC converters, namely, the buck, boost, buck-boost and cuk topologies. The VRAH-01CX500 is a DC – DC converter belonging to the buck topology.

Background

The VRAH-01CX500 is a high-frequency DC-DC buck converter IC, developed specifically for the purpose of supplying power directly to micro-controllers and DSPs using a very wide input voltage range of 4.5 – 24 VDC. Apart from the wide input voltage range, the VRAH-01CX500 has a capability of running at a frequency of 9 – 13.5 KHz, and can output at 0.4A with an output voltage adjustable range of 0.8 - 24VDC. The VRAH-01CX500 has various features like soft start, short circuit protection and overvoltage protection, and is suitable for various applications involving driving inductive loads such as motors, contracts, relays and coils.

Applications of VRAH-01CX500

VRAH-01CX500 is a suitable power supply for micro-controllers and DSPs for applications that require a wide input voltage range and higher load current than the conventional voltage regulator circuits. The VRAH-01CX500 is widely used in applications such as motor control, automotive electronics, security systems, lighting control, audio-video systems, audio amplifiers and in various consumer electronic products.

Working Principle

The VRAH-01CX500 functions with a buck topology. This allows the voltage to be dropped across the converter from the higher input voltage to the desired lower output voltage. This is done by providing a switching signal to the transistor, which turns on and off at regular intervals. This causes the voltage across the transistor to increase (during the on time) and decrease (during the off time) alternately. The current in the inductor increases (during the on time) and decreases (during the off time) alternately. The magnitude of the inductor\'s current is determined by the duty cycle of the switching signal.

When the transistor is on, the current in the inductor increases. During this time, the capacitor is charged from the input voltage. When the transistor is off, the current in the inductor decreases and the capacitor supplies the current to the load. This causes the voltage across the capacitor to drop, thereby producing an output voltage lower than the input voltage. By adjusting the duty cycle, the magnitude of the output voltage can be regulated.

Conclusion

The VRAH-01CX500 is an efficient DC-DC Buck converter IC designed with a wide input voltage range and the capability of running at a very high frequency. This IC is suitable for providing power to micro-controllers and DSPs in various applications like motor control, lighting control, audio amplifiers, and various consumer electronic products. The VRAH-01CX500 functions using the Buck topology, where the voltage is dropped from the higher input voltage to the desired lower output voltage by providing a switching signal to the transistor.

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