UC3525BN

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UC3525BN is an advanced switching controller designed and manufactured by Texas Instruments Inc. It is designed to drive inductive loads and maintain their current flow and voltage levels. The device integrates many advanced features such as pulse width modulation (PWM) control, under-voltage lockout (UVLO), soft-start and voltage scaling. The internal architecture of the device can be described as a self-oscillating output bridge that is interfaced to an on-chip error amplifier. The error amplifier compares the output voltage with a reference voltage and adjusts the PWM drive signals accordingly.

The device is well-suited for converters with high output current, intermediate DC-DC or AC-DC applications, low-voltage, high-current load switch applications, active voltage scaling applications and resonant converter applications. The range of applications for this device expands to include consumer electronics, automotive, telecommunications, industrial and computer systems operations. The device includes additional features such as a differential remote sense amplifier that ensures constant voltage even during periods of large load current fluctuations.

The output of the device is non-inverted and it derives its operating current from an internal 25 mA current source, which can also be adjusted externally. The device includes an external voltage divider to support current sense amplifiers and chipsets, making it suitable for monitoring the peak current and average current of an inductive load.R the operating range of the device is from 0.8 VDC to 8 VDC and it is designed with enhanced transient response performance.

The UC3525BN\'s control circuit combines an error amplifier, a fixed frequency oscillator, and a PWM comparator. The error amplifier compares the voltage reference and the feedback voltage signals and sends the difference,Vr, to the PWM comparator. The PWM comparator comparesVr with the output of the oscillator and generates the PWM signal. The oscillator voltage is scaled to match the level ofVr and is used to generate the pulse width modulated signal.

The output of the PWM comparator is routed to the gate drivers and switches, which use the signal to turn the output devices on and off to feedback the load current and maintain the output voltage. The device provides a very stable and accurate output voltage, and its soft-start feature eliminates transients,pulsations and inrush current at start-up. The device has an external soft-start pin for customized configurations.

The UC3525BN is designed to provide a robust and reliable power supply system with many advanced features and functions. Its ability to drive inductive loads while maintaining current flow and voltage accuracy makes this device suitable for a variety of high-power applications. The device has a wide range of applications in consumer electronics, automobile, telecommunications, industrial and computer systems operations.

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