UC3825AQ

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UC3825AQ is a high performance current mode Pulse Width Modulation controller which is widely used as a DC/DC switching controller in a variety of applications. It is one of the most popular DC/DC switching controllers in the PMIC – Voltage Regulators – DC DC Switching Controllers. It is optimized to provide constant frequency current mode control and provides the necessary features to implement a buck, boost, buck/boost or forward converter with a minimum number of components.

The main features of the UC3825AQ controller includes:

• Up to 65V power supply operation
• On-chip reference for 750 KHz operation
• Thermal shutdown function
• Feed-forward compensation
• Under-voltage lockout
• Current sense amplifier

The controller has two major sections: the error amplifier and the control section. The error amplifier is used to compare the output voltage with a reference voltage to generate an error signal. This error signal is used by the control section to adjust the pulse width that is applied to the power switches in order to maintain the output voltage at the desired level. This is known as the Constant Voltage Principle.

The control section of the controller includes a PWM comparator, an oscillator, a clock generator, and a logic network. The oscillator generates a square wave that is used to set the switching frequency of the power switches. This frequency can be adjusted by varying the current that is used to drive the oscillator. The clock generator is used to divide the oscillator frequency down to the appropriate level so that the PWM comparator can operate at the desired switching frequency. The PWM comparator generates a pulse width modulated signal that is used to drive the power switches. This signal contains the information to maintain the correct voltage for the output of the converter.

The UC3825AQ controller also includes a logic network which is used to monitor the output voltage and to protect against excessive current or temperature conditions. This logic is also used to control On/Off and Enable/Disable signals for the power switches, as well as Fault or Overload protection signals.

The UC3825AQ controller is an integrated device that combines all the features necessary to implement a wide range of DC/DC power converters in a single IC. It is an ideal choice for applications that require high efficiency at low output voltages with a minimum number of external components. It is also easily integrated into many existing power topologies with minimal modifications.

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