UC3856DW

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The UC3856DW is a type of DC/DC switching controller specifically designed for applications such as secondary-side, mains-powered, or high-voltage switching converters. It features an integrated switching frequency of up to 500kHz and a maximum operating input voltage of 40V. The device is constructed of the proprietary Silent Switcher® technology, allowing for low current switching noise, low electromagnetic interference (EMI) and a low component count.

The UC3856DW utilizes Pulse Width Modulation (PWM) to regulate a given output voltage by controlling the on/off ratio of a power switching transistor. It functions as a voltage regulator by ensuring that the output voltage does not deviate more than a few percent from the target setpoint. This is achieved by monitoring the output voltage through a voltage-divider network and comparing the voltage to an internal reference voltage. Any deviation results in the duty cycle of the PWM signal to the switching transistor being adjusted so as to keep the output voltage at or near the desired setpoint.

The UC3856DW utilizes a variety of protection features to ensure a safe and reliable operation of the switching converter. The device is designed to reduce or limit the current to an over-current protection (OCP) level and thus reduce the strain on the switching device. It also features an instantaneous on-time comparative voltage protection (IPC) to protect against active start conditions, as well as external under-voltage (UVP) and over-voltage (OVP) protection.

The UC3856DW also integrates frequency control, allowing it to switch at a frequency of up to 500kHz, making it ideal for high-voltage, secondary-side regulated power supplies. An external oscillator can be used to select different frequencies, allowing for a customized frequency response.

The UC3856DW is a highly effective switching controller for a variety of applications. Its integrated PWM system and protective features enable it to achieve a high degree of precision in regulating the output voltage while maintaining a high efficiency and low noise output. Its Silent Switcher® technology makes it optimally suited for a range of high-voltage and secondary-side regulated power supplies, making it the ideal choice for a number of industrial and consumer applications.

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