UC3841DWTR

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UC3841DWTR is an integrated switch-mode pulse-width modulating current mode controller with an externally compensated totem pole output. It is a medium power type switching controller (PMIC) for applications such as on-board or remote motor controls, AC/DC power supplies, switching regulators, etc. This device is classified as a DC-DC switching controller, which means it is capable of controlling the frequency and amplitude of a DC output voltage while switching on and off at a predetermined rate.

The UC3841DWTR contains a supply voltage regulated oscillator (OSC), a startup circuit and an error amplifier. The oscillator is designed to give a fixed period and frequency of oscillation, with variations due to external components. The startup circuit detects the minimum supply voltage and resets the error amplifier as the output voltage is ramped up at power turn-on. The error amplifier is essential for delivering tight voltage regulation. It consists of a differential amplifier for comparing either the output or the reference voltage with a proportional control voltage. The gain of the amplifier is set by a resistor and the offset voltage is trimmed to a low value.

The UC3841DWTR also contains current-sensing circuitry, a clamp transistor, a flip-flop and a totem pole output stage. The current sensing circuitry monitors the wirinig primary to secondary current. The peak primary current is set by setting the external resistor at pin 4 relative to GND. The flip-flop is primarily used to uncouple the OSC frequency from the output voltage. The clamp transistor is used for adjusting the oscillator peak voltage. The totem pole output switch is an NPN/PNP Darlington pair with a high-voltage charge pump that greatly reduces the current requirements from the regulator.

In summary, the UC3841DWTR is a multi-functional integrated circuit which incorporates all the necessary components to achieve efficient DC-DC power conversion in a very compact form factor. The integrated features make this an ideal component for a wide variety of high-efficiency, cost-effective applications.

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