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UCC28C55DR

TIUCC28C55DR

Texas Instruments
Buck, Boost, Flyback, Forward Converter, SEPIC Regulator Positive Output Step-Up, Step-Down, Step-Up/Step-Down DC-DC Controller IC 8-SOIC
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Overview

The UCC28C55DR is a high-performance current-mode PWM controller designed for versatile power topologies including Flyback, Forward, and Boost converters. It features a wide input range up to 28V and is functional safety-capable, making it suitable for high-reliability industrial and power supply designs.

Why Choose This Part

This controller offers a highly accurate 1 percent reference and cycle-by-cycle overcurrent limiting for precise regulation and protection. Its low startup current of 75uA reduces power loss in high-voltage startup circuits, while the 1A peak gate drive capability enables efficient driving of external MOSFETs.

Applications

Isolated Flyback Converters
Ideal for generating regulated DC rails from variable input sources in industrial power supplies.
Industrial Control Systems
Provides efficient power management for PLCs and factory automation modules requiring robust protection features.
Telecom Power Modules
Utilized in secondary-side regulation and auxiliary power supplies due to its low 75uA standby current.

Key Specifications

Function Step-Up, Step-Down, Step-Up/Step-Down
Topology Buck, Boost, Flyback, Forward Converter, SEPIC
Clock Sync Yes
Output Type Transistor Driver
Mounting Type Surface Mount
Output Phases 1
Package / Case 8-SOIC (0.154", 3.90mm Width)
Control Features Current Limit, Dead Time Control, Enable, Frequency Control, Soft Start
Duty Cycle (Max) 50%
Number of Outputs 1
Output Configuration Positive
Frequency - Switching 1MHz
Operating Temperature -40degC ~ 125degC (TJ)
Synchronous Rectifier Yes
Supplier Device Package 8-SOIC
Voltage - Supply (Vcc/Vdd) 30V

Getting Started

Start by selecting an appropriate MOSFET and transformer for your target topology, ensuring the maximum duty cycle does not exceed 50 percent. Use the TI WEBENCH Power Designer tool to simulate the circuit and verify the compensation network for the 2.5V error amplifier reference. Layout should prioritize short traces between the controller output and the MOSFET gate to minimize EMI and switching losses.