UCC28C42D

Duty Cycle:	96%
Base Part Number:	UCC28C42
Mounting Type:	Surface Mount
Supplier Device Package:	8-SOIC
Package / Case:	8-SOIC (0.154", 3.90mm Width)
Operating Temperature:	-40°C ~ 105°C (TA)
Control Features:	Frequency Control
Fault Protection:	Current Limiting
Frequency - Switching:	Up to 1MHz
Series:	--
Voltage - Supply (Vcc/Vdd):	9 V ~ 18 V
Voltage - Start Up:	14.5V
Topology:	Forward
Voltage - Breakdown:	--
Internal Switch(s):	No
Output Isolation:	Isolated
Part Status:	Active
Packaging:	Tube

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UCC28C42D Application Field and Working Principle

Introduction

UCC28C42D is a 2 A (3 A peak) 40/50 V/V I2C adjustable frequency current mode PWM controller adopted by Texas Instruments (TI). It is designed to provide a cost-effective and flexible alternative in off-line SMPS applications. UCC28C42D has an established compatibility in the field of PMIC - AC DC Converters, Offline Switchers.

Application Field

This device is particularly suitable for platforms like notebook adapters, PC motherboards and entry-level computer systems. UCC28C42D integrates current-mode PWM controllers for fast PWM current loop compensation, accurate line/load regulation and an I2C interface. I2C supplies real-time feedback signals from a power system, allowing an optimized design customization when used in various applications.UCC28C42D is widely used in low power switch mode power supplies, usually with a transformer, a rectifier, and the UCC28C42D in a voltage feedback arrangement. Other widely used application examples include switch mode adapters, such as wall adapters, LED drivers and high-current, high efficiency solutions. With excellent parameters, UCC28C42D is suitable for AC/DC wall adapters ranging from 8W to 45W, as well as offline switchers ranging from 15W to 75W.

Architecture and Working Principle

The UCC28C42D features a precision reference, high-frequency oscillator and PWM current sense comparator. These functions provide a powerful peak current mode control. It offers a switched-mode power supply design interface typically used in both AC/DC and DC/DC applications. With the reference section and leading-edge blanking (LEB), its architecture allows stable operation with external components located up to 1 meter away from the device, which makes the device easier to use.The design also features an improved average on/off time accuracy compared to many other constant frequency current modes based PWM controllers. UCC28C42D offers a wide switching frequency range, adjustable through the I2C port. The UCC28C42D has a differential remote sense pin compatible with an advancer PCB stack-up, which provides direct compensation for the addition of additional components away from the controller and improves overall loop stability. Moreover, Foldback Current Limiting (FCL) is added to prevent the power MOSFET from damage in accidental over-load conditions. Frequency jittering circuitry is built in the UCC28C42D for improving EMI performance to meet the latest standards.

Conclusion

UCC28C42D is an essential component in the market of PMIC - AC DC Converters, Offline Switchers. It may support a wide range of applications such as wall adapters, LED drivers and high-current, high-efficiency solutions. Its improved average on/off time accuracy, wide switching frequency range, differential remote sense design, foldback current limiting and frequency jittering circuitry provides great efficiency, reliability and stability.

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