TL2844DRG4

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TL2844DRG4 is an integrated PWM switching regulator controller with high-efficiency, low stand-by current and low noise. It has wide voltage range from 6V-30V and is capable to deliver up to 1A output current. It is designed for typical off-line converters and general-purpose applications.

TL2844DRG4 Application Field

TL2844DRG4 is primarily used in low power AC/DC offline switching applications. It can be used ina variety of different topologies such as flyback, forward and buck. With its broad input voltage range, low-cost and simple system design, it is an ideal solution for low-power AC/DC offline switching power supplies with current output as high as 1A.

TL2844DRG4 Working Principle

The TL2844DRG4 PWM regulator controller is basically a boost-type PWM converter. It works in non-synchronous rectification mode and uses a power MOSFET as the active switch. It generates a triangular waveform oscillator signal, which is compared with a reference voltage through the error amplifier and decision circuit. When the voltage exceeds the reference voltage, the MOSFET turns on, allowing the load current to flow through the output rectifier. At this time, the output voltage is slowly increasing, and the waveforms of the switching signal, inductor current and output voltage are all synchronized and cycled periodically. For example, when the inductor current has reached its peak value, the MOSFET will automatically turn off. Due to the stored magnetic energy in the inductor, the load current will still flow and the output voltage will slowly decrease. Finally, the waveforms will return to their original state and the cycle repeats.

Conclusion

TL2844DRG4 is a great cost-effective solution for offline power supplies and general-purpose applications with wide input voltage range and high efficiency. It also has low stand-by current and low noise characteristics. With its simple enable pin operation and working principle, it is a great choice for low power AC/DC offline switching applications.

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