JCG1212S2V5

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DC-DC converters come in many shapes and sizes, providing a reliable, cost effective, and efficient way to convert direct current (DC) from one voltage level to another. The JCG1212S2V5 buck converter is one such converter, designed for applications such as communications, consumer and industrial electronics, as well as automotive power systems.

The JCG1212S2V5 buck converter is a non-isolated variable voltage regulator that is designed to reduce input voltages down to a regulated output. It is a single-chip, monolithic, fixed frequency, high-efficiency, step down converter. It takes an input of up to 40V and can output voltages as low as 1.8V. The nominal output current is 2A; however, a maximum of 2.5A can be achieved. The switching frequency is fixed at 300kHz and the available external synchronization range is from 600 kHz to 900 kHz.

The internal components of the JCG1212S2V5 consist of an N-Channel MOSFET, integrated driver, gate resistors, and a control and protection circuit. The integrated gate driver allows for minimal external components, saving space and reducing cost. The internal MOSFET can handle up to 2.5A of load current. An enable/shutdown pin is used to control the on/off state of the converter. An adjustable soft-start time is available to control the inrush current as well as prevent large outputs from being reached immediately after turn-on. An under-voltage lock-out (UVLO) feature prevents the converter from starting up if the input voltage is too low.

The JCG1212S2V5 operates with a quasi-resonant (QR) constant-on-time (COT) control scheme which maintains regulation with a minimum of external components and a minimum number of design iterations. A high frequency synchronous rectifier is included to maintain efficiency. Pulse frequency modulation (PFM) is available to reduce total harmonic distortion (THD) and to maintainhigh power factor. A current-mode control architecture allows for reliable transient response with a wide input voltage range and line regulation. Protection features are also included such as thermal shutdown, over current protection, and output short-circuit protection. The converter is programmed via an external resistor-based divider. The converter is packaged in a 4x4mm QFN44 package.

The JCG1212S2V5 buck converter is a cost-effective, highly efficient, space-saving device for applications where a wide adjustable output range is desired. The integrated driver, gate resistors, and control/protection circuits ensure design simple, reliable operation and easy programming. The adjustable soft-start feature and the PFM function help protect the load and reduce electromagnetic interference. The output voltage is adjustable through an external resistor-based divider, allowing for custom output voltages. The wide input voltage range, high efficiency, and low cost make this converter a popular choice for applications such as communications, consumer and industrial electronics, and automotive power systems.

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