UCC3813N-3

Frequency - Switching:	31kHz
Base Part Number:	UCC3813-3
Supplier Device Package:	8-PDIP
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):	99%
Series:	--
Voltage - Supply (Vcc/Vdd):	3.6 V ~ 12 V
Output Phases:	1
Number of Outputs:	1
Topology:	Boost, Flyback, Forward Converter
Output Configuration:	Positive
Function:	Step-Up, Step-Up/Step-Down
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tube

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UCC3813N-3 Application Field and Working Principle

The UCC3813N-3 is a pulse width modulation (PWM) DC-to-DC switching controller designed for voltage regulation, power factor correction, and output current limiting. It is part of the PMIC - Voltage Regulators - DC DC Switching Controllers category. This device combines both primary and auxiliary feedback loops, which are suitable for a range of different applications.

Features

The UCC3813N-3 features a wide input voltage range from 4.5 V to 50 V and programmable output current limit. It also integrates an internal oscillator with on/off control and programmable frequency adjustment. Other features include a low quiescent current, an under-voltage lockout, an inhibit logic control, adjustable current and voltage monitoring, an open loop line voltage feedforward, and non-linear current-limit control.

Applications

This device is suitable for a wide range of applications such as motor control, power supplies, voltage regulators, DC-motor drive systems, UPSs, and telecom systems. It provides benefits such as reduced EMI, improved efficiency and dynamic response, power factor correction, and low input current ripple.

Working Principle

The UCC3813N-3 utilizes an internal oscillator to control the switching of the power switch. An integrator circuit and an internal error amp loop generates a triangular wave used for generating the pulse width modulation (PWM) signal. The PWM signal controls the switching on/off values of the power switch.The oscillator operates in closed loop mode with the primary and auxiliary feedback loops. The primary feedback loop implicates the output voltage regulation of the system and the auxiliary feedback loop implicates the power factor correction. The system will also consider over/under voltage and output current to regulate the output voltage.The internal error amp monitors the differential voltage between the voltage reference and the feedback voltage. If the error is greater than the trip level, the error amp will control the oscillator to increase or decrease the output frequency. Therefore, the output voltage and current is controlled by the feedback loops.In the event of an overtemperature or an over-current, the system will immediately power down in order to protect the device from damage. It also has an inhibit logic control feature which can disable or enable the PWM control. This device requires an external N-channel MOSFET in order to switch the load.

Conclusion

The UCC3813N-3 is a PWM DC-to-DC switching controller designed for voltage regulation, power factor correction, and output current limiting. It integrates a wide range of features such as programmable output current limit, low quiescent current, under-voltage lockout, adjustable current and voltage monitoring, and non-linear current-limit control. It is suitable for a wide range of applications such as motor control, power supplies, voltage regulators, DC-motor drive systems, UPSs, and telecom systems. The system uses an internal oscillator to control the switching of the power switch, and both the primary and auxiliary feedback loops to regulate the output voltage and current.

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