DC2171A-A

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DC2171A-A is an evaluation board from Linear Technology. It is an off-line switch mode power supply (SMPS) controller. This type of controller offers high efficiency and low standby power operation in regulating the output voltage of AC/DC and DC/DC SMPS applications. It is designed to address a wide variety of output power level and power topology requirements.

Applications

DC2171A-A is an ideal choice for use in a variety of AC/DC and DC/DC applications. Common applications include:

• Power supplies for office equipment, computers and consumer electronics
• Uninterruptible power supplies (UPS)
• Industrial SMPS
• High power audio amplifiers
• Lighting and security systems

Design

The DC2171A-A is based on Linear Technology\'s LT3966 flyback SMPS controller. It is a fixed-frequency current-mode PWM controller designed to regulate an output voltage from a flyback converter. Its integrated high/low side drivers provide a peak output current of 7A (4A continuous) with very low output ripple and good line regulation.

The main components of the evaluation board are the LT3966 controller, the high/low side gate driver IC and the N-channel MOSFET. To protect the MOSFET and the controller, current limiting and thermal protection circuitry are also included. The MOSFET is connected to the input and output through an inductor and Schottky diode, which reduce voltage drops and maintain the efficiency of the circuit.

Working Principle

The operating principle of DC2171A-A is based on the well-known flyback converter. In this circuit, an inductor is connected in series with the input power source and the output voltage is regulated by switching the MOSFET on and off at a fixed frequency. This results in a voltage being induced across the inductor, which is stored in an output capacitor, providing the desired output voltage at the load.

When the MOSFET switches off, the energy stored in the inductor is transferred to the load, allowing the load to be powered even when the input voltage drops below the output voltage.

Conclusion

The DC2171A-A is a versatile off-line SMPS controller from Linear Technology. It is suitable for a wide range of AC/DC and DC/DC applications, providing high efficiency and low standby power operation. By using the flyback converter topology, the controller provides a simple, reliable and cost-effective solution for regulating the output voltage of SMPS applications.

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