UC3844BDR2

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UC3844BDR2 is a high performance, low power digital controller which is specialized for off-line, fixed frequency current-mode switching power supplies. The UC3844BDR2 is available in SOT-89 package, only 4 external components are needed to realize excellent line and load regulation. It is suitable for controlling power supplies with power range from a few watts up to 100 watts.

Overview

UC3844BDR2 is a high performance, low power digital controller which is specialized for off-line, fixed frequency current-mode switching power supplies. It is available in SOT-89 package, only 4 external components (resistors, diodes and capacitors) are needed to realize excellent line and load regulation. It is suitable for controlling power supplies with power range from a few watts up to 100 watts.

UC3844BDR2 uses an advanced BiCMOS process to provide superior performance with low power consumption. Its VLSI design and power Transistor output stage make the output waveform free of high frequency noise. A simple line and load regulation circuit is used to limit the peak switch current and avoid audible noise.

Application Field of UC3844BDR2

UC3844BDR2 is suitable for off-line, fixed frequency current-mode switching power supplies. It has an excellent line and load regulation feature, makes the power supply more stable and reliable.

UC3844BDR2 is used in a wide range of applications, such as gaming consoles, game controllers, portable audio players, TV receivers, home theater systems, DVD players, portable DVD players and laptops. It is also used in low power lighting systems, such as LED lighting, wall TV/projector lighting, LED signs, lamps/lighting.

UC3844BDR2 is used for other applications such as switching mode power supplies, lighting applications, motor speed controllers, power converters, power line notification systems, etc.

Working Principle of UC3844BDR2

UC3844BDR2 is a digital control circuit, which is composed of signal processing, control, amplifying, power output and peripheral components.

UC3844BDR2 uses an advanced BiCMOS process to provide superior performance with low power consumption. Its VLSI design and power Transistor output stage make the output waveform free of high frequency noise. A simple line and load regulation circuit is used to limit the peak switch current and avoid audible noise.

The UC3844BDR2 uses an error amplifier, based on the current through a power MOSFET, to accurately control the output current. This control circuit provides a constant switching frequency, and the ON period is adjusted by varying the current control signal, thus maintaining a constant output voltage with varying load.

The power output stage controls the MOSFET to switch ON/OFF at a constant frequency, the voltage at the sense resistor is compared to an internal reference voltage, the present error is amplified and used as the MOSFET’s drive signal. This constant frequency operation creates an operating efficiency of approximately 65%.

The external components such as capacitors, diodes, and resistors are used to damp the oscillations and keep the power supply stable and reliable. The UC3844BDR2 also provide comprehensive protection features, such as over current and over temperature protection.

Conclusion

UC3844BDR2 is a high performance, low power digital controller which is specialized for off-line, fixed frequency current-mode switching power supplies. It is suitable for controlling power supplies with power range from a few watts up to 100 watts. UC3844BDR2 is used in a wide range of applications, such as gaming consoles, game controllers, portable audio players, TV receivers, etc. It uses an advanced BiCMOS process to provide superior performance with low power consumption and it has an excellent line and load regulation feature, makes the power supply more stable and reliable.

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