XC6121E649ER-G

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DC-DC step-down converters, also known as Buck converters, are a type of electronic power converter which steps down the input voltage to provide a lower output voltage. The XC6121E649ER-G is a digital-only DC-DC step-down adjustable power supply (APS) specifically designed for use as a DC-DC step-down adaptor, providing reliable on-demand power at low cost with very low noise and varying output voltage. By bringing together some of the most advanced power conversion solutions into a simple, easy to use package, the XC6121E649ER-G offers a complete power supply solution for a wide range of applications.

Application Field

The XC6121E649ER-G PMIC - Supervisors offers a highly efficient regulated output from a wide input voltage range, making it suitable for a wide range of applications. It is ideal for low cost embedded systems, industrial controllers, telecom, servers and other portable applications such as data acquisition systems, remote control systems and standby power supplies. It is also ideal for the automotive, transportation and wireless sector, providing the highly efficient and robust power supply solutions needed for these environments. The device offers multiple packaged versions; available in SIP, three pin devices and through-hole versions.

The XC6121E649ER-G provides a precision regulator capable of driving multiple output rails in parallel with a highly efficient, low cost and low noise operation. Its adjustable output voltage goes from 0.8V up to 20V and is optimized for a wide range of input voltage sources, from 5V to 300V. Its wide output current range, from 0.5A to 5A, makes this device suitable for almost any kind of application.

Operating Principle

The XC6121E649ER-G regulated step-down DC-DC converter works on the basic principle of buck converters. Buck converters are used to regulate a high input voltage to a lower output voltage, with a high efficiency, over a range of input voltages. The XC6121E649ER-G operates by utilizing a fixed frequency pulse width modulation (PWM) control architecture, providing a tight output voltage regulation, minimum ripple and a wide operating range. Regulation is achieved by modulating the duty cycle of the PWM signal which provides a minimum on-time for the switch, by varying the off-time of the switch. The modulated PWM signal is then used to drive a power MOSFET or IGBT power switch.

The XC6121E649ER-G also provides a simple compensation circuitry for easy loop stabilization and control, through an external resistor. This in turn allows for a fast transient response and good regulation accuracy. The device is able to start up from a wide range of targets, even when the input supply is less than the output voltage. The adjusted loop can operate no load, be disabled or be forced to the maximum duty cycle.

The XC6121E649ER-G also integrates several safety features to ensure the reliability and safety of the system. The FLT output (fault detect output) indicates all fault conditions, like OVP, OTP, OCP and UVLO. All faults can be easily detected by simple monitoring of the FLT output.

Conclusion

The XC6121E649ER-G PMIC - Supervisors is an excellent option for a cost-effective, reliable and efficient step-down DC-DC converter. Its wide input voltage range and adjustable output voltage, coupled with its highly efficient, low cost and low noise operation, make it an ideal choice for a wide variety of applications, signifying its great value.

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