UC2843ADTR Integrated Circuits (ICs)

Frequency - Switching:	Up to 500kHz
Base Part Number:	UC2843A
Supplier Device Package:	14-SOIC
Package / Case:	14-SOIC (0.154", 3.90mm Width)
Operating Temperature:	-40°C ~ 85°C (TA)
Control Features:	Frequency Control
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	No
Duty Cycle (Max):	96%
Series:	--
Voltage - Supply (Vcc/Vdd):	7.6 V ~ 30 V
Output Phases:	1
Number of Outputs:	1
Topology:	Boost, Buck, Buck-Boost, Flyback, Forward
Output Configuration:	Positive
Function:	Step-Up, Step-Down, Step-Up/Step-Down
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tape & Reel (TR)

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UC2843ADTR Application Field and Working Principle

UC2843ADTR is a voltage regulation controller belonging to PMIC(Power Management Integrated Circuit) specifically DC DC Switching Controllers. It is a pulse width modulation (PWM) controller featuring a voltage regulation system with an output voltage sensing feedback mechanism. UC2843ADTR is used to ensure the output voltage is regulated constantly and stably despite the load being dependent on the input voltage. It works by controlling the voltage-to-current ratio of an inductor or capacitor which is implemented to form an LC resonance tank. The on-time and off-time in the pulse width modulation are regulated accordingly to maintain the desired output voltage.

Operation

The function of UC2843ADTR is to maintain a steady output voltage at a desired level. The process begins when the input voltage is applied to the chip, allowing current to be delivered to the load for the output voltage to be generated. In PWM mode(enabled by the PWM/FOL signal), the duty cycle of the output switch is controlled by the output voltage sensing feedback input compared to the reference voltage. The duty cycle is determined by the on-time/off-time ratio in such a way that the output voltage diminishes as the load increases and vice versa. This ensures that the output voltage is maintained at a predetermined level.

Protection Features

UC2843ADTR is designed to protect the circuit from damage due to unstable operating conditions. It possesses important features such as over-voltage protection (OVP), current-limit protection (CLP), short-circuit protection (SCP) and thermal protection (TP). OVP shuts down the output switch when the output voltage surpasses the preset threshold, protection the circuit from potential catastrophic damage occurred from over-voltage. current-limited protection limits the current flow through the output switch. If the current tries to surpass the predetermined limit, the device will automatically shut down the output switch, protecting the circuit from overheating and damages caused by the large current flow. The short-circuit protection is triggered when the load is short-circuited and thus, drives the current beyond the current limit. At this time, the device will shut down the output switch, protecting the circuit.Finally, the thermal protection prevents possible damage due to overheating of the internal circuitry of UC2843ADTR. When the temperature of the device surpasses the preset temperature, it will shut down, preventing the chip from being damaged.

Application of UC2843ADTR

UC2843ADTR is widely used in power-supply systems, especially in AFE(Adaptive Front-End) power-supply system. AFE power-supply systems require the output power of the supply system to be stable and reliable, or else error signals or instability within the system will be created. Therefore, voltage regulation controllers such as UC2843ADTR are used to ensure an efficient power supply with an output voltage that is stable and consistent.UC2843ADTR is also widely used in battery charging systems such as a NICD/NiMH battery charger. It is important that the output voltage of the battery charger is regulated accurately to ensure that the battery is charged and discharged adequately. This is achieved by the implementation of UC2843ADTR, providing a reliable voltage regulation that protects the battery life.Apart from that, it is also used in DC power converters, AC/DC switchers, buck converters, as well as sine-wave inverters. In most such applications, UC2843ADTR is used to regulate the output voltage of the power sources, ensuring an efficient and reliable system.In conclusion, UC2843ADTR is a critical device for providing accurate and reliable regulation of the output voltage of a variety of power-supply systems. It is designed with vital protection features to ensure that the circuit is safe from potential damage due to unstable operating conditions. Its wide variety of usage effectively covers a number of complex power control problems, making it an ideal choice for power-supply system designs.

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