UCC3884 - 频率折回电流模式 PWM 控制器

UCC3884是TI德州仪器公司的一款PWM与谐振控制器产品，UCC3884是频率折回电流模式 PWM 控制器，本站介绍了UCC3884的封装应用图解、特点和优点、功能等，并给出了与UCC3884相关的TI元器件型号供参考。

UCC3884 - 频率折回电流模式 PWM 控制器 - PWM与谐振控制器 - 离线隔离型DC/DC控制器和转换器 - 德州仪器

产品描述

The UCC3884 is a high performance current mode PWM controller intendedfor 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. Excessive short circuit current is more prevalent in high frequency converters where the propagation delay and switch turn-off time forces a 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.

产品特性

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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