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PMIC - Voltage Regulators - DC DC Switching Controllers

TL3843DRG4 Application Field and Working Principle

The TL3843DRG4 is a high-speed, high-efficiency DC-DC switching controller which combines the low cost and smaller size of an integrated circuit with the regulated voltage of a transformer. It is intended to be used in a wide array of low or medium power switching applications, such as DC-DC converters, motor speed controlers, defibrillator chargers, portable electronic devices, and many industrial, automotive and commercial control applications.

The TL3843DRG4, is a pulse-width modulated (PWM) controller that achieves high power conversion efficiency, over a wide range of input and output voltages, through the use of its internally sensed, high and low-side BiCMOS power switches. The TL3843DRG4 is designed to provide either a regulated voltage or current mode control, depending on the external components connected to the device. The device is capable of driving power MOSFETs at up to 500 KHz, and includes many features such as feedforward current limiting, low voltage lock-out, and adjustable frequency.

The TL3843DRG4 operates with an operating temperature range of -40 to 125°C, and is withstand much higher temperatures in electrostatic discharge environments. The device is ratings come in 8-pin PDIP and 8-pin SOIC packages, and is lead and halogen free, making it suitable for use in sensitive environments.

Application Fields

The TL3843DRG4 is a versatile DC-DC switching controller, and as such it has been adapted for use in a wide array of applications. It is an excellent choice for virtually any voltage- or current-controlled, high-efficiency, low-power application. The device is ideally suited for industrial and commercial control applications, such as motor speed control, defibrillator chargers, portable devices, and many other applications that require fast response, low on-resistance, and low off-board resistance.

The device is also suitable for automotive applications where it can be used in conjunction with power MOSFETs to provide a high level of power conversion efficiency and low on-resistance. Additionally, the device can be used in battery powered applications, where its adjustable switching frequency helps to reduce high frequency noise and minimize power consumption.

Working Principle

The TL3843DRG4 is a pulse-width modulated (PWM) controller that works by switching power between its two power switches using a fixed frequency scheme. The two power switches enable the device to switch voltages as high as 500 KHz, and allow for a wide range of input and output voltages.

The TL3843DRG4 works by sensing the incoming voltage on its input and then adjusting the duty cycle of the internal MOSFETs to regulate the output voltage or current. The regulated voltage or current is then used to power the output stage, which can include power MOSFETs for DC-DC conversion, or inductors and capacitors for AC-DC conversion.

The device also features current-mode control, with an adjustable current limit. This feature helps to limit the power delivered to the output stage, ensuring that the current remains within acceptable limits. In addition, the adjustable frequency allows for a wide range of switching frequencies, enabling the device to be optimized for efficiency and noise reduction.

Conclusion

In conclusion, the TL3843DRG4 is a high-speed, high-efficiency DC-DC switching controller that combines the low-cost and small size of an integrated circuit with the regulated voltage of a transformer. The device is an excellent choice for virtually any voltage or current controlled low-power application, offering excellent performance and long-term reliability.

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