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UC3868 谐振模式电源控制器

	UC3868
Topology	Boost, Flyback, Forward
Control Method	Voltage Mode
Duty Cycle(Max)(%)	1
Frequency(Max)(kHz)	450
UVLO Thresholds On/Off(V)	8/7
Pin/Package	16PDIP
Regulated Outputs(#)	1
Operating Temperature Range(°C)	0 to 70
Rating	Catalog

UC3868 描述

The UC1861-1868 family of ICs is optimized for the control of Zero Current Switched and Zero Voltage Switched quasi-resonant converters. Differences between members of this device family result from the various combinations of UVLO thresholds and output options. Additionally, the one-shot pulse steering logic is configured to program either on-time for ZCS systems (UC1865-1868), or off-time for ZVS applications (UC1861-1864).

The primary control blocks implemented include an error amplifier to compensate the overall system loop and to drive a voltage controlled oscillator (VCO), featuring programmable minimum and maximum frequencies. Triggered by the VCO, the one-shot generates pulses of a programmed maximum width, which can be modulated by the Zero Detection comparator.

UC3868 特性

• Controls Zero Current Switched (ZCS) or Zero Voltage Switched (ZVS) Quasi-Resonant Converters
• Zero-Crossing Terminated One-Shot Timer
• Precision 1%, Soft-Started 5V Reference
• Programmable Restart Delay Following Fault
• Voltage-Controlled Oscillator (VCO) with Programmable Minimum and Maximum Frequencies from 10kHz to 1MHz
• Low Start-Up Current (150µA typical)
• Dual 1 Amp Peak FET Drivers
• UVLO Option for Off-Line or DC/DC Applications

UC3868 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
UC3868DW	ACTIVE	0 to 70	1.90 | 1ku	SOIC (DW) | 16	40 | TUBE	UC3868DW
UC3868DWG4	ACTIVE	0 to 70	1.90 | 1ku	SOIC (DW) | 16	40 | TUBE	UC3868DW
UC3868N	ACTIVE	0 to 70	1.90 | 1ku	PDIP (N) | 16	25 | TUBE	UC3868N
UC3868NG4	ACTIVE	0 to 70	1.90 | 1ku	PDIP (N) | 16	25 | TUBE	UC3868N

UC3868 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
UC3868DW	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR		UC3868DW
UC3868DWG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	UC3868DWG4	UC3868DWG4
UC3868N	Green (RoHS & no Sb/Br)	CU NIPDAU	N/A for Pkg Type		UC3868N
UC3868NG4	Green (RoHS & no Sb/Br)	CU NIPDAU	N/A for Pkg Type	UC3868NG4	UC3868NG4

UC3868 应用技术支持与电子电路设计开发资源下载

1. UC3868 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)

UC3868 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
UC3868 评估模块	UC3868EVM	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