UCC3813PWTR-1

Frequency - Switching:	46kHz
Base Part Number:	UCC3813-1
Supplier Device Package:	8-TSSOP
Package / Case:	8-TSSOP (0.173", 4.40mm Width)
Operating Temperature:	0°C ~ 70°C (TA)
Control Features:	Frequency Control
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	No
Duty Cycle (Max):	49%
Series:	--
Voltage - Supply (Vcc/Vdd):	7.4 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:	Discontinued at Digi-Key
Packaging:	Tape & Reel (TR)

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Introduction

The UCC3813PWTR-1 is a low-cost DC/DC controller designed for PWM and pulse skip mode at 5-V/3-A output and 3-V/3-A synchronous buck converter applications. It features a wide input voltage range (12 to 65V), low quiescent current, tight line/load regulation, and an adjustable soft start mode. This device is suitable for both AC and DC operation, with up to 85% efficiency.

Application Field and Working Principle

The UCC3813PWTR-1 makes a great choice for application in automotive, emergency lighting, avionics, digital cameras and handheld devices. It can also be used for industrial applications in isolation and bias combinations.The basic application circuit for the UCC3813PWTR-1 includes a voltage reference, a PWM amplifier and the external components necessary to form the switch-mode voltage regulator. The built-in current sensing circuitry ensures excellent load regulation. When the output voltage reaches its programmed value, the current limit circuit trips and shuts off the output.The integrated PWM comparator senses the voltage reference, comparing it with the sense voltage, and generates PWM signals based on the amplified error. To prevent output short-circuit, the converter circuit has an internally generated voltage limit. Plus, by changing the current setting pins, output voltage levels and external switches, the user can set up the switching cycles. The UCC3813PWTR-1 also supports dynamic current share -- when the output current is higher than the sum of the individual channel current levels, the channel currents are dynamically adjusted based on the practical output current limit. This ensures that all the channels share the total current equally, while maintaining overall output current at the required level.Using a wide input voltage range and current limit circuitry, the UCC3813PWTR-1 is capable of providing constant current operation over a wide range of output current levels. Additionally, its PWM clock frequency and pulse duration are programmable through an external resistor, enabling applications for wide range of output voltage levels. Moreover, its soft start circuitry assists in the power-up sequences, eliminating the unwanted output voltage overshoot. Together with cycle-by-cycle current limiting, overvoltage protection and thermal protection, this device offers improved system reliability and reduced power dissipation.

Conclusion

The UCC3813PWTR-1 is an ideal choice for 5-V/3-A output and 3-V/3-A synchronous buck converter applications. It has wide input voltage range (12 to 65V) and has tight line/load regulation, with up to 85% efficiency. With its integrated PWM comparator sensing the voltage reference, the device provides excellent load regulation, short-circuit protection, and current-sharing capabilities. Additionally, the soft start circuitry eliminates unwanted output voltage overshoots, making the device a reliable choice for automotive, emergency lighting, avionics, digital cameras and handheld devices.

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