UC3849 二次侧平均电流模式控制器

UC3849 描述

The UC3849 family of average current-mode controllers accurately accomplishes secondary side average current mode control. The secondary-side output voltage is regulated by sensing the output voltage and differentially sensing the ac switching current. The sensed output voltage drives a voltage error amplifier. The ac switching current, monitored by a current sense resistor, drives a high bandwidth, low offset current sense amplifier. The outputs of the voltage error amplifier and current sense amplifier differentially drive a high bandwidth, integrating current error amplifier. The sawtooth waveform at the current error amplifier output is the amplified and inverted inductor current sensed through the resistor. This inductor current down-slope compared to the PWM ramp achieves slope compensation, which gives an accurate and inherent fast transient response to changes in load.

	UC2849	UC3849
Duty Cycle(Max)(%)	85	85
Frequency(Max)(kHz)	1000	1000
Pin/Package	24PDIP, 24SOIC	24SOIC
Regulated Outputs(#)	1	1
Operating Temperature Range(°C)	-40 to 85	0 to 70
Rating	Catalog	Catalog

UC3849 特性

• Practical Secondary Side Control ofIsolated Power Supplies
• 1 MHz Operation
• Differential AC Switching Current Sensing
• Accurate Programmable Maximum Duty Cycle
• Multiple Chips Can be Synchronized to Fastest Oscillator
• Wide Gain Bandwidth Product (70 MHz, Acl >10) Current Error and Current Sense Amplifiers
• Up to Ten Devices Can Easily Share a Common Load

UC3849 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
UC3849DW	ACTIVE	0 to 70	1.75 | 1ku	SOIC(DW) | 24	25 | TUBE	UC3849DW
UC3849DWG4	ACTIVE	0 to 70	1.75 | 1ku	SOIC(DW) | 24	25 | TUBE	UC3849DW
UC3849DWTR	ACTIVE	0 to 70	1.70 | 1ku	SOIC(DW) | 24	2000 | LARGE T&R	UC3849DW
UC3849DWTRG4	ACTIVE	0 to 70	1.70 | 1ku	SOIC(DW) | 24	2000 | LARGE T&R	UC3849DW

UC3849 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
UC3849DW	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR		UC3849DW
UC3849DWG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	UC3849DWG4	UC3849DWG4
UC3849DWTR	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR		UC3849DWTR
UC3849DWTRG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	UC3849DWTRG4	UC3849DWTRG4

UC3849 应用技术支持与电子电路设计开发资源下载

1. UC3849 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)

UC3849 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
UC3849 评估模块	UC3849EVM	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