UC3843N Integrated Circuits (ICs)

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UC3843N is a highly integrated PWM controller IC. It is a member of Texas Instrument’s family of pulse with modulation (PMIC) voltage regulators and DC-DC switching controllers. UC3843N is designed for AC/DC power supplies and DC/DC converters in telecom, bus, industrial and consumer applications. The device operates on a supply voltage range of 5.0V to 20V. It has a quiescent current of 4mA and a temperature range of -40 to +85 °C.

UC3843N is a member of integrated PMIC Voltage Regulators and DC-DC switching controllers to provide high precision control of DC-DC converters and power supplies. This device incorporates a pulse width modulator control circuit that automatically performs pulse-by-pulse current limiting and/or voltage regulation. It enables high frequency switching to reduce system size and reduce power losses. An internal under-voltage lockout circuit and an over-voltage trip circuit are also incorporated, providing an optimum level of protection for the external switching elements.

The UC3843N is an integrated circuit that is based on a non-linear, fixed-frequency current-mode PWM control with the addition of many other features. The device is optimized for operation with MOSFET and bipolar power switches. It is particularly suitable for low-power and high-performance switch-mode applications such as SMPS and battery chargers. The UC3843N provides precise regulation of output voltage or current with minimum external components. Its precise current and voltage regulation ability makes possible a simple and precise implementation of power supplies.

The UC3843N takes the control voltage from the transformer secondary and regulates it to the desired voltage level. The device has an integrated oscillator, an internal synchronous rectifier control, and a soft-start with an internal compensation circuit. The built-in oscillator runs at a frequency of about 67kHz and it is temperature compensated for stability. The device includes an internal overvoltage circuit that trips and shuts off the output voltage when it reaches a certain level.

The UC3843N is designed to be used with a wide range of MOSFETs. For gate driving, the pin that controls the gate turn-on is capable of sinking or sourcing up to 200mA, while the pin that controls gate turn-off can sink or source up to 300mA. Additionally, the device also has a frequency foldback circuit that reduces the switching frequency at light loads, helping to reduce power losses. Finally, the internal synchronous rectifier control circuit allows the use of a low-cost rectifier in both single-ended and push-pull topologies.

In summary, the UC3843N is a highly integrated PWM controller IC which provides precise voltage or current regulation and overvoltage protection with a minimum of external components. The device is rated for a supply voltage range of 5.0V to 20V and a temperature range from -40 °C to +85 °C. Its precise regulation ability, low quiescent current, and wide operating temperature range make it an ideal choice for low-power and high-performance switch-mode power supply applications.

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