UC3823QG3

Frequency - Switching:	340kHz ~ 460kHz
Base Part Number:	UC3823
Supplier Device Package:	20-PLCC (9x9)
Package / Case:	20-LCC (J-Lead)
Operating Temperature:	0°C ~ 70°C (TA)
Control Features:	Current Limit, Enable, Frequency Control, Ramp, Soft Start
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	No
Duty Cycle (Max):	85%
Series:	--
Voltage - Supply (Vcc/Vdd):	8.4 V ~ 30 V
Output Phases:	1
Number of Outputs:	1
Topology:	Buck, Boost, Flyback, Forward Converter
Output Configuration:	Positive
Function:	Step-Up, Step-Down, Step-Up/Step-Down
Output Type:	Transistor Driver
Part Status:	Obsolete
Packaging:	Tube

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UC3823QG3 Application Field and Working Principle

The UC3823QG3 integrated circuit belongs to PMIC voltage regulators: DC DC switching controllers. It is a high accuracy, current mode voltage regulator provided with cycle-by-cycle current limiting, soft start,enable, shutdown and reverse battery protection for variable frequency buck converters.

Features

The UC3823QG3 IC\'s key features make it a popular choice in applications including VRM, Laptop DC-DC converters, IPMs (intelligent power modules), Computer power supplies, SMPS (switched-mode power supplies), PWM (pulse width modulation) controllers, LED drivers and high voltage systems. It provides the following advantages:

• Accurate Current Mode Control
• Frequent-Cycle Current Limit
• Configurable Overshoot/Undervoltage Protection
• 1.5% Internal Voltage Reference
• Soft-Start and Enable
• Shutdown and Reverse Battery Protection

Applications

The UC3823QG3 is used in variable frequency buck converters and other power applications like board level and notebook PCs power supplies, VRMs, switching power supplies and motor/battery charging supplies. It is capable of controlling wide input range with a single output. Its accuracy and fast transient response help to make it an ideal choice for these applications.

Working Principle

The UC3823QG3 is a current mode control device featuring a high accuracy, low operating power, and built-in diagnostic features. It works in the following manner:1. The UC3823QG3 receives an externally derived reference voltage as an input. This reference voltage is used in order to regulate the power supply output voltage to the desired value.2. When the input voltage surpasses the reference voltage threshold, the UC3823QG3 begins to increase the frequency of switching operation. This helps to reduce the voltage ripple and provide the power supply output with a more stable voltage.3. The UC3823QG3 also helps to provide protection against overvoltage and undervoltage conditions. It does this by monitoring the input voltage for signs of these conditions and, if detected, it responds by disabling the power supply output and/or by either increasing or decreasing the output voltage as required.4. Other features of the UC3823QG3 include current and crossover limit protection, soft start and enable, reverse battery protection and shutdown features.

Conclusion

The UC3823QG3 is a popular IC belonging to PMIC voltage regulators: DC DC switching controllers. It is well-suited for use in a variety of applications, due to its accurate current mode control, frequent-cycle current limits, configurable overshoot/undervoltage protection, 1.5% internal voltage reference, soft-start, enable, shutdown and reverse battery protection features. It works by receiving an externally derived reference voltage as an input and adjusting the switching frequency in order to maintain the output voltage in the desired range. With its features and benefits, the UC3823QG3 is widely used in board level and notebook PCs power supplies, VRMs, switching power supplies and motor/battery charging supplies.

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