UC3846DW

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The UC3846DW is a monolithic low-side pulse-width modulation (PWM) controller for off-line or DC to DC power supplies. This controller can be used to regulate the output voltage of a switching power supply over a wide range of input voltages. The UC3846DW is designed to operate from a freewheeling diode or other rectified input source with minimal additional circuitry. The controller adjusts the output voltage by controlling the duty cycle of a switch frequency power stage with synchronous rectification.

The UC3846DW is a popular choice for applications such as household appliances, power converters, telecom systems, UPS’s, motor control, laptop computing and battery charging. It is also suitable for applications requiring very low component count.

Working Principle:

The working principle of the UC3846DW is relatively simple. It adjusts the output voltage of a switched, synchronous rectification power supply by controlling the duty cycle of the switch. Once the correct duty cycle is set, the power supply operates in a continuous cycle of converting the input voltage to the desired output voltage with synchronous rectification. The UC3846DW uses a comparator to sense the output voltage, and an internal feedback loop to adjust the duty cycle accordingly.

The UC3846DW also features an overload protection circuit that prevents the switching regulator from over-loading the output when the input is subjected to large spikes or transients. Additionally, an external resistive voltage divider can be used to adjust the output to a fraction of the input voltage. This feature can be used in applications such as battery charging, where the output voltage must be limited to prevent over charging of the battery.

Conclusion:

The UC3846DW is a monolithic low-side pulse width modulation controller that is suitable for DC to DC power supplies and off-line applications. This controller can be used to regulate the output voltage of a switching power supply over a wide range of input voltages, and is suitable for applications such as household appliances, power converters, telecom systems, UPS’s, motor control, laptop computing and battery charging. It features an overload protection circuit and an adjustable output voltage for battery charging applications.

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