Datasheet > UCC3884QTR

UCC3884QTR

更新时间： 2024-09-24 18:38:03

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德州仪器 - TI		/
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UCC3884QTR 数据手册

UCC2884

UCC3884

www.ti.com............................................................................................................................................. SLUS160C–AUGUST 1999–REVISED NOVEMBER 2008

Frequency Foldback Current Mode PWM Controller

FEATURES

DESCRIPTION

•

Frequency Foldback Reduces Operating

Frequency Under Fault Conditions

The UCC3884 is a high performance current mode

PWM controller intended for single ended switch

mode power supplies. The chip implements

•

Accurate Programmable Volt-Second Clamp

Programmable Maximum Duty Cycle Clamp

Oscillator Synchronization

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. Excessive short circuit current is

more prevalent in high frequency converters where

the propagation delay and switch turn-off time forces

Overcurrent Protection

Shutdown With Full Soft Start

Wide Gain Bandwidth Amplifier (GBW > 2.5

MHz)

•

Current Mode Operation

Precision 5-V Reference

minimum attainable duty cycle. An accurate

volt-second clamp limits the duty cycle during line or

load transient conditions which could otherwise

saturate the transformer. The volt-second clamp may

also be used with an external overvoltage protection

circuit to handle fault conditions such as current

sense disconnect or current transformer saturation.

The frequency foldback, volt-second clamp,

cycle-by-cycle current limit, and overcurrent shutdown

provide a rich set of protection features for use in

peak current-mode pulse width modulators.

OSCILLATOR SYNCHRONIZATION

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas

Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

12 3 4 5 6 7...12

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