UC3843AD8G4

Frequency - Switching:	Up to 500kHz
Base Part Number:	UC3843A
Supplier Device Package:	8-SOIC
Package / Case:	8-SOIC (0.154", 3.90mm Width)
Operating Temperature:	0°C ~ 70°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:	Tube

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UC3843AD8G4 Application Field and Working Principle

Introduction

The UC3843AD8G4 is a versatile, high performance integrated PWM controller specifically designed for DC-DC converters. It is ideal for a wide range of power supplies, including switched-mode power supplies (SMPS) for personal computers, laser printers, copiers and various industrial applications. This particular device is rated for 8A drain current, can handle 64V output voltage and provides an adjustable switching frequency from 1 to 250 kHz.

Application Field

The UC3843AD8G4 is typically used in computer power supplies, including workstations, servers, mainframes, desktops and laptops. This PMIC is extremely versatile and can be used as a main controller in power supplies with high output voltage and load current requirements, as well as a backup controller in situations where the main controller fails. It can also be employed as a secondary or tertiary controller to provide additional current or voltage regulation.The UC3843AD8G4 is also capable of providing stable output voltage and current in lighting applications, including incandescent, halogen, fluorescent and LED lights. Other popular uses for this device include medical and industrial equipment, consumer electronics, automotive electronics and power tools.

Working Principle

At its core, the UC3843AD8G4 is a PWM controller with several integrated features. It uses a pulse-width-modulated voltage feedback loop to regulate the output voltage of DC-DC converters. The feedback loop is also used to limit the load current, preventing it from exceeding the device’s maximum current rating.The device is also equipped with an oscillator, which is used to set the switching frequency of the device. The oscillator has two independent oscillator stages which can be used to set the switching frequency and adjust the device’s internal reference voltage. The oscillator can be set to accept an external synchronization signal, allowing multiple controllers to be synchronized on the same frequency.The UC3843AD8G4 also has a current limit circuit with adjustable hysteresis, which allows the user to adjust the device’s current limit threshold. The device can be configured to operate in either current mode or voltage mode control, allowing additional flexibility and ease of control.

Conclusion

The UC3843AD8G4 from Texas Instruments is a versatile, high-performance PMIC specifically designed for DC-DC converters. It is ideal for a wide range of applications, catering to the demands of both industrial and consumer electronics. Its integrated features, such as pulse-width modulation, adjustable load current and oscillator synchronization, make it an extremely versatile solution for both high- and low-power applications.

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