UC3843AM

Frequency - Switching:	Up to 500kHz
Base Part Number:	UC*84
Supplier Device Package:	8-DIP
Package / Case:	8-DIP (0.300", 7.62mm)
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, 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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UC3843AM is a high performance current-mode PWM (pulse width modulation) controller from STMicroelectronics. It is a monolithic integrated circuit designed for controlling switching regulators. With its high performance and low power consumption, it is an ideal solution for high-powered switching regulator applications. It has an operating voltage range of 2.7V - 5.5V and a maximum junction temperature of 150°C.
The UC3843AM features a leading-edge current-mode PWM control architecture. This architecture provides quick and accurate transient response, excellent light load efficiency and current-mode control stability. In addition, its wide operating frequency range makes it suitable for different operating conditions and applications. The UC3843AM utilizes a low noise error amp which allows for high precision regulation and fast response. It also features a MOSFET driver with a high current capability, allowing it to handle high power applications.
The UC3843AM application field is mainly related to voltage regulation used in switching regulators. The main working principle of the UC3843AM is to regulate the output voltage by comparing the actual output voltage with a reference voltage. The reference voltage is set by the external components like resistors, capacitors and inductors. Based on the comparison result, the PWM control signals are generated to control the switching regulator. The PWM control signals control the ON and OFF time of the power MOSFET. When the ON time is longer than the OFF time, the output voltage will be higher. Conversely, when the OFF time is longer than the ON time, the output voltage will be lower. The UC3843AM also features over-current, over-voltage and under-voltage protection to ensure safe operation of the switching regulator.
In summary, the UC3843AM is a current-mode PWM controller that is ideal for high power switching regulators. It features a leading-edge current-mode PWM control architecture which provides quick and accurate transient response, excellent light load efficiency and current-mode control stability. The UC3843AM features a low noise error amp and MOSFET driver that allows it to handle high power applications and provide efficient voltage regulation. It also features various protections to ensure safe operation.

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