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UCC2884 Datasheet Frequency Foldback Current Mode PWM Controller

Manufacturer: Texas Instruments

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General Description

The UCC3884 is a high performance current mode PWM controller intended for single ended switch mode power supplies.

The chip implements a frequency foldback scheme that decreases the oscillator frequency as the output voltage falls below a programmed value.

This technique decreases the average output current sourced into a low impedance load which can occur during an output short circuit or overload condition.

Overview

UCC2884 UCC3884 www.ti.com.............................................................................................................................................

Key Features

  • 1.
  • Frequency Foldback Reduces Operating Frequency Under Fault Conditions.
  • Accurate Programmable Volt-Second Clamp.
  • Programmable Maximum Duty Cycle Clamp.
  • Oscillator Synchronization.
  • Overcurrent Protection.
  • Shutdown With Full Soft Start.
  • Wide Gain Bandwidth Amplifier (GBW > 2.5 MHz).
  • Current Mode Operation.
  • Precision 5-V Reference.

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