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UCC3884 频率折回电流模式 PWM 控制器

	UCC3884
Topology	Boost, Buck, Flyback, Forward
Control Method	Current Mode
Duty Cycle(Max)(%)	78
Frequency(Max)(kHz)	750
UVLO Thresholds On/Off(V)	9.1/8.8
Pin/Package	16PDIP, 16SOIC
Regulated Outputs(#)	1
Operating Temperature Range(°C)	0 to 70
Rating	Catalog

UCC3884 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.

UCC3884 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

UCC3884 芯片订购指南

器件	状态	温度 (oC)	价格（美元）	封装 | 引脚	封装数量 | 封装载体	丝印标记
UCC3884D	ACTIVE	0 to 70	2.10 | 1ku	SOIC (D) | 16	40 | TUBE	UCC3884D
UCC3884DG4	ACTIVE	0 to 70	2.10 | 1ku	SOIC (D) | 16	40 | TUBE	UCC3884D
UCC3884N	ACTIVE	0 to 70	2.10 | 1ku	PDIP (N) | 16	25 | TUBE	UCC3884N
UCC3884NG4	ACTIVE	0 to 70	2.10 | 1ku	PDIP (N) | 16	25 | TUBE	UCC3884N

UCC3884 质量与无铅数据

器件	环保计划*	铅/焊球涂层	MSL 等级/回流焊峰	环保信息与无铅 (Pb-free)	DPPM / MTBF / FIT 率
UCC3884D	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR		UCC3884D
UCC3884DG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	UCC3884DG4	UCC3884DG4
UCC3884N	Green (RoHS & no Sb/Br)	CU NIPDAU	N/A for Pkg Type		UCC3884N
UCC3884NG4	Green (RoHS & no Sb/Br)	CU NIPDAU	N/A for Pkg Type	UCC3884NG4	UCC3884NG4

UCC3884 应用技术支持与电子电路设计开发资源下载

1. UCC3884 数据资料 dataSheet 下载.PDF
2. TI 德州仪器AC/DC 和 DC/DC 电源产品选型与价格参考 . xls
3. Dual MOSFET Driver (PDF  498 KB)
4. 标准线性产品交叉参考 (Rev. D)   (PDF  1058 KB)
5. 模数规格和性能特性术语表 (Rev. A) (PDF 1993 KB)
6. 所选封装材料的热学和电学性质 (PDF 645 KB)
7. 高速数据转换 (PDF 1967 KB)
8. Shelf-Life Evaluation of Lead-Free Component Finishes (PDF 1305 KB)
9. Analog-to-Digital Converter Grounding Practices Affect System Performance (PDF 56 KB)
10. Principles of Data Acquisition and Conversion (PDF 50 KB)
11. Interleaving Analog-to-Digital Converters (PDF 64 KB)
12. What Designers Should Know About Data Converter Drift (PDF 95 KB)
13. Giving Delta-Sigma Converters a Gain Boost with a Front End Analog Gain Stage (PDF 70 KB)
14. Programming Tricks for Higher Conversion Speeds Utilizing Delta Sigma Converters (PDF 105 KB)

UCC3884 工具与软件

名称	型号	公司	工具/软件类型
音频的快速搜索选择工具	AUDIO_SELECTION_TOOL	Texas Instruments	免费评估工具
UCC3884 评估模块	UCC3884EVM	Texas Instruments	开发电路板/EVM
用于音频转换器的软件驱动程序	CODECDRIVERS-SW	Texas Instruments	应用软件