UC3848 平均电流模式 PWM 控制器

UC3848 描述

The UC3848 family of PWM control ICs makes primary side average current mode control practical for isolated switching converters. Average current mode control insures that both cycle by cycle peak switch current and maximum average inductor current are well defined and will not run away in a short circuit situation. The UC3848 can be used to control a wide variety of converter topologies.

In addition to the basic functions required for pulse width modulation, the UC3848 implements a patented technique of sensing secondary current in an isolated buck derived converter from the primary side. A current wave-form synthesizer monitors switch current and simulates the inductor current down slope so that the complete current waveform can be constructed on the primary side without actual secondary side measurement.

	UC2848	UC3848
Topology	Boost, Buck, Flyback, Forward	Boost, Flyback, Forward
Control Method	Current Mode	Current Mode
Duty Cycle(Max)(%)	100	100
Frequency(Max)(kHz)	450	450
UVLO Thresholds On/Off(V)	13/10	13/10
Pin/Package	16SOIC	16PDIP, 16SOIC
Regulated Outputs(#)	1	1
Operating Temperature Range(°C)	-40 to 85	0 to 70
Rating	Military	Catalog

UC3848 特性

• Practical Primary Side Control of Isolated Power Supplies with IC Control of Secondary Side Current
• Accurate Programmable Maximum Duty Cycle Clamp
• Maximum Volt-Second Product Clamp to Prevent Core Saturation
• Practical Operation Up to 1MHz
• High Current (2A Pk) Totem Pole Output Driver
• Wide Bandwidth (8MHz) Current Error Amplifier
• Under Voltage Lockout Monitors VCC, VIN and VREF
• Output Active Low During UVLO
• Low Startup Current (500µA)
• Precision 5V Reference (1%)

UC3848 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
UC3848DW	ACTIVE	0 to 70	1.75 | 1ku	SOIC (DW) | 16	40 | TUBE	UC3848DW
UC3848DWG4	ACTIVE	0 to 70	1.75 | 1ku	SOIC (DW) | 16	40 | TUBE	UC3848DW
UC3848DWTR	ACTIVE	0 to 70	1.70 | 1ku	SOIC (DW) | 16	2000 | LARGE T&R	UC3848DW
UC3848DWTRG4	ACTIVE	0 to 70	1.70 | 1ku	SOIC (DW) | 16	2000 | LARGE T&R	UC3848DW
UC3848N	ACTIVE	0 to 70	1.75 | 1ku	PDIP (N) | 16	25 | TUBE	UC3848N
UC3848NG4	ACTIVE	0 to 70	1.75 | 1ku	PDIP (N) | 16	25 | TUBE	UC3848N

UC3848 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
UC3848DW	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR		UC3848DW
UC3848DWG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	UC3848DWG4	UC3848DWG4
UC3848DWTR	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR		UC3848DWTR
UC3848DWTRG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	UC3848DWTRG4	UC3848DWTRG4
UC3848N	Green (RoHS & no Sb/Br)	CU NIPDAU	N/A for Pkg Type		UC3848N
UC3848NG4	Green (RoHS & no Sb/Br)	CU NIPDAU	N/A for Pkg Type	UC3848NG4	UC3848NG4

UC3848 应用技术支持与电子电路设计开发资源下载

1. UC3848 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)

UC3848 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
UC3848 评估模块	UC3848EVM	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