UC3525ADW

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A versatile cost-effective switching controller, the UC3525A/ADW device is a high speed, on-time controller designed for PWM switching regulators and switching converters. It also ideal for many AC and DC motor control applications, including brushed DC drives, switching power supplies and DC-DC converters. The device has a wide operating voltage range (7V-40V), making it suitable for a variety of control and drive applications. The UC3525A/ADW can be used to regulate pulse width modulated DC motor drives, build buck and boost regulators, automotive systems, etc.

Operating Principle

The UC3525A/ADW works as a high speed on-time regulator that controls the output voltage level of a switch mode converter by controlling the switching drive. It does this by modulating on-times of the usually PWM drive waveforms in response to a control voltage or an external current or voltage input. The device uses an internal oscillator that generates the frequency of the line driving the switches.

The on-time of switching waveform is controlled by the ramp waveform generated in the internal oscillator. This waveform is compared to an external voltage or the input current to determine when the switching waveform will start and stop. When the waveform generated by the internal oscillator reaches a predefined level, the output of the device will turn on or off, depending on the application.

Operating Modes of UC3525A/ADW

In the UC3525ADW, the drive waveform is controlled by three distinct operating modes, which are: Pulse-Width Modulation (PWM) Mode, Burst Mode, and Linear Mode. In the PWM mode, the drive waveform is generated in a periodic sequence, with an on-time proportional to the input voltage or current. The PWM waveform is suitable for applications such as DC to DC conversion, voltage cut or over voltage protection or motor control.

In the Burst mode, the drive waveform is generated in a burst format and is suitable for power supplies that require low peak currents and good efficiency. The device will be active in both on and off states and will incrementally turn off or turn on, depending on the input or output voltage levels. Finally, the Linear Mode is used for applications that require low peak current and high efficiency that allows for a more direct control over the output voltage.

Additional Features of the UC3525A/ADW

The UC3525A/ADW is a versatile and cost-effective switching controller. It has several features that make it an ideal choice for a variety of applications, including a wide operating temperature range, noise immunity, and a high operating frequency range. The device also has an adjustable frequency range, an internal on-time generator, and an adjustable PWM control pin.

The device also has a slew rate control feature that allows for better implementation of the drive waveform and soft start and protection features such as over-temperature, over-current, over-voltage, and under-voltage protection. The device also has high-output current drive capabilities up to 2.5 Amps. This makes it suitable for a variety of motor control applications.

Conclusion

The UC3525A/ADW is a cost-effective, versatile switching controller. It is ideal for PWM switching regulators and converters, brushed DC drives, power supplies and DC-DC converters. It has a wide operating voltage range and adjustable frequency, making it suitable for a variety of applications. The device has several features including a high output current drive, over-temperature, over-current, over-voltage and under-voltage protection, and noise immunity, making it an ideal choice for a variety of motor control and power supply applications.

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