UC2842AQD8

Frequency - Switching:	Up to 500kHz
Base Part Number:	UC2842AQ
Supplier Device Package:	8-SOIC
Package / Case:	8-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):	10 V ~ 30 V
Output Phases:	1
Number of Outputs:	1
Topology:	Boost
Output Configuration:	Positive
Function:	Step-Up
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tube

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Introduction

UC2842AQD8 is an advanced monolithic DC to DC switching controller integrated with several safety features making it suitable for use in a variety of industrial control and process automation applications. With a wide-temperature range, a maximum operating frequency of up to 500kHz and a soft start time of up to 10ms, it is designed to increase system efficiency and also to reduce controllable switching noise and power dissipation.

Application Field

UC2842AQD8 can be used in a variety of industrial process automation and control applications. Examples include power supplies, inverters, motor control, battery chargers and level shifting. It is suitable for both linear and switch mode power supplies, making it an ideal choice for applications requiring both high voltage and efficiency.

Working Principle

The UC2842AQD8 starts and stops the switching cycle by detecting the start-up current and the return current during each switching cycle. Its proprietary auto-tuning technique enables it to operate at a higher frequency than other types of controllers without any deterioration in efficiency.The UC2842AQD8 features over-voltage protection, under-voltage protection, over-current protection, cycle-by-cycle current limit and soft start functions. The over-voltage protection feature prevents the switching cycle from continuing beyond a predetermined level and the threshold can be adjusted. The under-voltage protection feature monitors the output voltage in order to protect the system from an unexpected voltage drop. The over-current protection feature is designed to prevent the system from drawing excessive current.The UC2842AQD8 also includes the cycle-by-cycle current limit feature which monitors both the input and output current to ensure that the maximum current is not exceeded. Finally, the soft start feature enables the switching cycle to start slowly, thus reducing the inrush current and providing smooth, efficient start up.

Conclusion

UC2842AQD8 is an advanced monolithic DC to DC switching controller with a wide operating range and a variety of safety features. It is suitable for use in industrial process automation and control applications, as well as power supplies, inverters, motor control, battery chargers and level shifting. Its built-in auto-tuning feature, over-voltage and under-voltage protection, cycle-by-cycle current limit and soft start functions further enhance its ability to increase system efficiency.

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