TL2842DE4-8

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TL2842DE4-8 Application Field and Working Principle

The TL2842DE4-8 is a cost-effective, wide input voltage range, DC/DC switching controller IC. It adopts current-mode control and provides high performance power conversion products with a very small chip area. This product is designed for applications such as notebook computers, USB chargers, and 3C-like products, as well as other applications that require adjustable output voltage and/or current.

Balance charge and discharging is a very important application of TL2842DE4-8. Based on the voltage of its two outputs, current balance charging and discharging are realized for two battery packs with different capacities and voltages. For example, when two sets of 12V 75AH and 42AH lead battery packs are connected in parallel, TL2842DE4-8 can take the lead in balance charging and discharging. In order to obtain a better charging experience, a lithium battery governor chip with a large constant power factor, TL2842DE4-8 responds quickly to voltage error with the help of Low ESR tantalum capacitor.

The TL2842DE4-8 has many outstanding features. It is stable with ceramic bypass capacitor, and the soft-start time and current sensing time are both adjustable. It has "Brown-out Detection" feature, which can reduce system failure, protect feedback loop and can be used in harsh environment. In addition, the component\'s 0.8A/1.5A/2A/4A MOSFET currents can be adjusted, and the available power capability ranges from 0.6W to 10W. Therefore, it is suitable for a variety of applications.

The main working principle of TL2842DE4-8 is to use the error amplifier to detect and compare the output voltage sensed by the feedback pin, and then generate an error signal to control the power MOSFET switch through the current sense comparator to regulate and maintain the constant output voltage. The current of the sense comparator is optimized according to the "remote sink/source" concept and the open loop gain of the error amplifier is 140dB. Therefore, the TL2842DE4-8 can provide a regulation accuracy of better than ±10mV in output voltage, with better than ±1mV in line/load regulation.

TL2842DE4-8 is a reliable, efficient, and cost-effective DC/DC switching controller, suitable for many diverse applications. Its high accuracy and fast response characteristics make it suitable for low power applications such as mobile and portable systems. Its features provide the highest performance available, while maintaining low operating voltage, current and temperature characteristics.

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