TL2842DR-8

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TL2842DR-8 Application Field and Working Principle

TL2842DR-8 is a DC-DC switching controller belonging to the class of PMIC (Power Management Integrated Circles). It is specialized in voltage regulation and switching applications, of which operating input voltage ranges from - 8.0V to 48.0V. The versatile applications of TL2842DR-8 are centered in step-up, step-down and voltage inverting operations, due to its many built-in enhanced protection functions, e.g. UVLO, OVP etc.

TL2842DR-8 applications cover a wide variety of fields, from power sources and power management systems, battery chargers and DC-DC converters, portable device and industrial equipments, etc. In most of the cases, TL2842DR-8 is used to regulate on-board voltages in order to extend battery life, to offer stable and constant currents, and to assure safe and robust operation in order to avoid damaging the main systems.

Working Principle

TL2842DR-8 consists of a reference voltage source, an error amplifier, a PWM generator and a high power switch. The DC output voltage is maintained in an accurately level by comparing this output voltage with a fixed reference voltage and exhausting the difference through the error amplifier. The current flowing in a power switch controls the output voltage by acting as a proportional element. When the output voltage becomes greater than the reference voltage, the current signal reaches the limits of the error amplifier and the switching current is reduced, thus the output voltage decreases. On the contrary, when the output voltage is smaller than the reference voltage, the current signal will increase and lead to the voltage stepping-up.

In the TL2842DR-8, feedback is normally carried out through the voltage divider, where R1 (the internal resistance of the device) and R2 (the external feedback resistance) adjust the output voltage level. The analog control loop provides good line and load regulation in addition to low output impedance and fast transient response.

Since the device includes an on-chip comparator circuit it can be operated in a current mode, allowing the user to reduce output noise at the expense of bandwidth and stability. Moreover, low side synchronous rectification can be easily carried out.

Enhanced Features of TL2842DR-8

TL2842DR-8 has been designed to provide a reliable, well-performing switching solution. It features an array of features, such as RDS(ON) comparator, UVLO, OVP, OTP, digital trimming, deadtime compensation, etc. All these functionalities add to the robustness of the system, thus increasing reliability and lifetime.

Most importantly, the TL2842DR-8 also offers flexibility. Easy setting of fixed frequency and switching frequency synchronization (up to 32kHz) may be achieved by setting control pins. This allows the user to design the best suited circuit for their specific application.

In conclusion, the DC-DC switching controller TL2842DR-8 is a reliable and effective device, covering a wide range of field applications in power management systems, battery charges and DC-DC converters. It offers a cost effective solution to voltage regulation and switching needs, due to its enhanced protection functions and versatile control features.

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