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UC3526ADW Application Field and Working Principle

The UC3526ADW from Texas Instruments is a DC-DC switching controller with a very large portfolio of integrated features. It is targeted for applications with very small output currents, such as appliances, laptop computer supplies, battery charging and other high-efficiency systems. There are a number of versions available, with operating frequency from 400 kHz up to 600 kHz.

UC3526ADW Application Fields

The UC3526ADW is designed for multiple types of applications, including buck, boost, flyback, and forward buck-boost converters. It is a very versatile device well suited to a variety of different applications. Specific application fields include:

• Computer power supplies (DC-DC)
• Battery chargers
• White goods
• Telecommunications equipment
• Consumer electronics

UC3526ADW Operating Modes

The UC3526ADW offers two operating modes to better match the power transfer requirement of the application: continuous conduction mode (CCM) and discontinuous conduction mode (DCM). Depending on external components, the device can also support a burst mode operation.

UC3526ADW Features

The UC3526ADW features integrated functions such as :

• Maximum switching frequency of 600 kHz
• Flexible protection features such as short circuit protection and over temperature protection
• Accurate current limit with programmable slope compensation
• Differential sensing of the output current
• Programmable soft start window
• Programmable frequency foldback
• Optional phase-shifted modulation for reduced EMI
• Output under voltage lockout (UVLO)

UC3526ADW Working Principle

The UC3526ADW operates on a dual-loop system, that uses the output voltage and output current as feedback signals to adjust the duty cycle of the high side switch and hence regulate the output voltage. The UC3526ADW uses one external resistor, one voltage divider and an error amplifier to sense the output voltage and regulate it. This is the voltage loop. The current loop is control by the transconductance amplifier and allows to adjust the duty cycle of the internal switch to regulate the output current.

The UC3526ADW is an ideal choice for applications requiring high efficiency and low noise operation. The device requires minimal external components to operate, with its high level of integration and the dual loop design, making it capable of operating in both continuous and discontinuous conduction mode for seamless transition between them.

Conclusion

The UC3526ADW is an advanced, high performance switching controller from Texas Instruments. It is highly integrated, requiring minimal external component and tailored for a variety of applications. The dual-loop design provides robust regulation of the output voltage and current, for improved efficiency and performance.

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