UC2846QG3

Frequency - Switching:	500kHz
Base Part Number:	UC2846
Supplier Device Package:	20-PLCC (9x9)
Package / Case:	20-LCC (J-Lead)
Operating Temperature:	-40°C ~ 85°C (TA)
Control Features:	Current Limit, Enable, Frequency Control, Soft Start
Serial Interfaces:	--
Clock Sync:	Yes
Synchronous Rectifier:	Yes
Duty Cycle (Max):	--
Series:	--
Voltage - Supply (Vcc/Vdd):	6.95 V ~ 40 V
Output Phases:	1
Number of Outputs:	2
Topology:	Boost, Flyback, Forward Converter, Full-Bridge, Half-Bridge, Push-Pull
Output Configuration:	Positive
Function:	Step-Up, Step-Up/Step-Down
Output Type:	Transistor Driver
Part Status:	Obsolete
Packaging:	Tube

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UC2846QG3 Application Field and Working Principle

PMIC（Power Management IC）are devices that are universally used to contain a finite amount of power in circuits in order to control the current and voltage. Voltage regulators are a part of this PMIC and play an important role in converting one voltage to another. DC DC switching controllers are a type of voltage regulator that use an oscillator and a switching element in order to switch between two rail voltages. The UC2846QG3 is an integrated circuit developed by Texas Instruments that falls under this specific category and has become widely used due to its precision and advantageous features.

Physical Characteristics and Features

The UC2846QG3 is packaged in an 8 pin DIP configuration and uses a power supply voltage of up to 40V. It has a maximum output current of 8A and an operating temperature range of -40°C to 125°C. It has an enable pin and several other pins dedicated to feedback, frequency control, fault protection, and inverting/non-inverting outputs. The enable pin can be used to turn the device on and off at will.

Application Field

The UC2846QG3 can be used in a variety of scenarios to convert a DC voltage. Common applications include regulating regulated power supplies, battery-operated electronic equipment, and the power regulation of motor equipment.

Working Principle

The UC2846QG3 uses a series of P- and N-channel MOSFETs in order to switch between two voltage rails. It works in linear mode when the duty cycle is between 50% and 100%, and operates in pulse-width modulation (PWM) mode when the duty cycle is below 50%. When in PWM mode, an oscillator produces an alternating voltage signal at the PWM pin. This signal is compared to a reference voltage to determine the duty cycle of the switching operation, thus regulating the output current and voltage.

Protection Features

The UC2846QG3 includes numerous protection features that maintain the safety of the system. These include overcurrent and overvoltage protection, thermal shutdown, and short circuit protection. Additionally, there is a fault pin that signals when any of these conditions occur so that the system can shut down before damage is done to any components.

Conclusion

The UC2846QG3 is an innovative DC DC switching controller that is capable of providing current and voltage regulation to a variety of applications. With its high current capacity, robust design, and integrated protection features, it is the perfect solution for any system that needs reliable power regulation.

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