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UC2526N Application Field and Working Principle

UC2526N is a DC-DC switching controller, categorized under voltage regulators, developed and manufactured by Texas instruments. DC-DC voltage controllers are used to regulate direct current voltage, with the help of Pulse-width modulation (PWM).

Overview

The UC2526N is a current mode controller, utilized for implementing an off-line switching regulator with minimal external components. It comes with a Current Sensing and Error Amplifier, flip-flop, and PWM comparator, which together play an important role in regulating the DC voltage. This current mode controller is specifically designed to minimize voltage and current control, boost regulator and fly-back transformer designs.

Features

• Operating voltage range: 5V-36V
• Withstand voltage range: 7V - 48V
• Current Sense Voltage: 0.3V to 2.2V
• Voltage Reference Amplifier with 0V to 10V output
• Output current sense limitation with level selection function
• High Voltage switching
• Overcurrent protection
• Programmable Soft Start
• Adjustable PWM frequency
• Low standby power consumption

Working Principle

The UC2526N is designed to monitor and control the switching mode operation of an external power switch for converting a DC voltage supply. It operates in current mode. The pulse width modulation (PWM) signal generated by the UC2526N controls the external power switch. This signal regulates the average power delivered to the load, to ensure output voltage stability.

The UC2526N has two comparators connected in series; the error amplifier and the PWM comparator. When the output voltage of the error amplifier falls, the PWM comparator initiates the next PWM pulse necessary to raise the output voltage up again. The UC2526N begins to close the switch without waiting for the previous pulse to terminate.

It also controls the on-time of the pulse-width modulation cycle, and thus regulates the output voltage. A lower PWM frequency will result in a higher output voltage. This device has a built-in current sensing, allowing it to limit over-current in the system.

Conclusion

To conclude, the UC2526N is an optimal solution for off-line power conversion systems. It helps to maintain efficient and safe voltage regulation, with integrated features such as a current sensing, error amplifier, flip-flop and PWM comparator, and adjustable PWM frequency. This reduces system costs, as external components are minimized.

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