UC3527BN

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UC3527BN is a monolithic integrated high frequency switch-mode power converter developed by Texas Instruments. The device features a fixed-frequency linear crest saturation current control or pulse width modulation (PWM) control, that provides excellent control and efficiency performance. It is capable of regulating output voltage to any specified level with a low power dissipation and is suitable for applications such as DC-DC converters, switching power supplies, uninterruptable power supplies (UPS), or telecoms.

Application Field

The UC3527BN is frequently used in a variety of applications, such as DC-DC converters, switching power supplies, uninterruptable power supplies (UPS), or telecoms. It is mainly designed for step-down applications in order to regulate output voltage for a given load.

In switching power supplies, it enables high efficiency across a wide range of load current to minimize the amount of power wasted. It is also well-suited for controlling power flows after a power fault or failure to provide uninterrupted power supply.

DC-DC converters use the UC3527BN to generate power with a fixed voltage and current at a certain frequency, mainly for portable and media devices such as laptops, smartphones, and tablets.

Finally, the UC3527BN is widely used in telecoms to provide varying levels of output voltage for power line communications, as well as for power management solutions.

Working Principle

The UC3527BN integrates both the power control circuit and the output stage in a single integrated circuit. To control the output voltage, it uses either a linear crest saturation current control or pulse width modulation (PWM) control.

The internal current controller monitors the current flow through the output stage and provides feedback to the power control circuit. The power control circuit then modulates the current by adjusting the duty cycle of the output switch.

In linear crest saturation current control, the control voltage is adjusted to maintain a constant current flow through the output stage. This approach offers reasonably good output regulation with low power dissipation, but can suffer from limited load current regulation.

PWM control also adjusts the control voltage to maintain a constant current flow. But it does so by adjusting the duty cycle of the output switch. This results in better current regulation and improved efficiency.

In either mode of operation, the UC3527BN is capable of effectively regulating the output voltage and current, resulting in improved efficiency and power dissipation.

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