Frequency - Switching:	Up to 500kHz
Base Part Number:	UC2843AQ
Supplier Device Package:	14-SOIC
Package / Case:	14-SOIC (0.154", 3.90mm Width)
Operating Temperature:	-40°C ~ 125°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
Output Configuration:	Positive
Function:	Step-Up
Output Type:	Transistor Driver
Part Status:	Obsolete
Packaging:	Tube

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UC2843AQD Application Field and Working Principle

Introduction

The UC2843AQD is a DC-DC switching controller which provides a number of features with regards to pulsed-width modulation (PWM), current mode control, and thermal protection. Developed by Texas Instruments, this chip has a wide variety of uses ranging from AC/DC power supplies to motor control and robotics. Its application field and working principles are discussed in the following sections.

Application Field

The UC2843AQD controller can be used in a variety of power supply designs, ranging from DC-DC converters and power supply units to AC-DC converters and switch mode power supplies (SMPS). It can be used to regulate variable input voltages, such as those provided by a battery. It is also suitable for applications requiring fail-safe and soft-start functions, such as motor control and robotics. Furthermore, it provides the ability to monitor the voltage and current using external sensing or sampling techniques.

Working Principle

The UC2843AQD DC-DC switching controller employs a pulse width modulation (PWM) technique to control voltage and current. Under normal operation, the controller continuously monitors the output voltage and current, to ensure that it is within the desired range. In the case of an overvoltage, the controller will activate its internal clock in order to reduce the frequency of the PWM signal, thus decreasing the output voltage.The controller also utilizes current mode control (CMC) in order to regulate the output current. The CMC circuit monitors the peak current and modifies the PWM signal, as required. This technique offers higher accuracy and better response time than the standard PWM technique.The device also features a thermal protection circuit, which is designed to protect against over-temperature conditions. The thermal protection circuit continuously monitors the temperature of the device and will shut down the device if the temperature exceeds the maximum operating temperature.

Conclusion

In conclusion, the UC2843AQD DC-DC switching controller is a versatile and reliable solution for a variety of power supply designs. It features a PWM technique and CMC functionality, which enable it to accurately and quickly regulate both current and voltage. Additionally, it provides thermal protection, which protects the device from over-temperature conditions. The UC2843AQD is thus an ideal choice for applications where precision, accuracy, and reliability are essential.

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